Let me preface this by saying I freaking love TNA and I would support any magic-wielding genie who could make TNA bigger than WWE. I don't have anything personally against WWE, but one can't escape the underlying sense of evil it embodies.
Im still very much of the opinion that TNA doesn't need to compete with WWE directly, outside of talent.
I always hear "competing for ratings" but that was only a thing when TNA tried to reignite the Monday Night Wars with 1/10th the viewerbase.
Yes, they tried to compete with the biggest dog in the yard and got ass-shivved. Actually, I don't think ass-shivved is dramatic enough, but I'll leave it at that. I would probably attribute it to Hogan (a man whose delusions have delusions) and Easy E (a man whose go-to solution for any problem is to throw heaps of somebody else's money at it). The ghost of WCW is still very much with TNA, but there two were the unsalted bones keeping it awake.
If the Monday Night Wars v.10000000001 taught us anything, it's that you can never compete with WWE. Whether it's Tony Schavione, Vince Russo or Kevin Nash, something will always fuck you up royally. All the other bigger promotions have their very own niche, but it's still something TNA struggles a litle to get. On the other hand, with Destination America and Pop, TNA as a fed proved to be one tough sonofabitch.
TNA needs to just focus on producing the best product they can, Daniel Bryan would go a long way to meet that goal, even if they "misuse him" the Smarks would tune back in to see him compete at the very least and TNA gets more exposure.
I do think that TNA is producing a very good product at the moment and with Russo finally gone (and hopefully fucking ritually sacrificed to the Inca god of optimistic calender-making), Impact is going to be more about stories, wrestling and new beginnings and much less about showing up WWE. I used to be in denial about it, but AJ's departure, EY's first title run and various other stories were blatant rip-offs. TNA doesn't need that, they have very distinct stars of their own (Storm, Roode, EY, etc) who give TNA its unique flavour, as well as a team of extremely talented younger guys who would do well to do things differently than they did in the WWE and be more Impacty versions of themselves (EC3, Galloway, Tyrus).
With regards to Daniel Bryan, I wouldn't offer him the moon if I were TNA. Going after established stars and paying them up the whazoo is what got TNA in trouble in the first place. Yes, Bryan is a big star in the wrestling business, but the same business is absolutely not what is was twenty years ago. The average slackjaw on the street is not going to suddenly hear about this guy called Brian Daniels who is at TNA from WWE. Mainstream popularity is not an extremely realistic goal here. Not to mention that the internet fans won't be satisfied with anything less than Ultimate Warrior levels of pushing everybody's favourite underdog, which kind of defeats the purpose of having a scruffy overcomer like DBry in the first place.
I doubt EC3 or Galloway came with the same price tag a guy like Bryan would probably come, but you'd also get at least triple the name value (not knocking on Drew or Bateman). The question would be if that 2x, 3x or (dare I say) 4x name value would translate in that big a ratings spike.
Then there's the question of his long absence. It did, indeed, make the heart grow fonder. DB was at his absolute peak main-eventing WM 30 before getting struck by injury. WM31 was cool too, but the real question remains - what would Vince be able to do with Bryan once the initial high of Wrestlemania was over? Bryan remains untested as a face of the WWE. The man may look like Blonde Jesus, but it's still not 100% sure whether or not he would be able to carry TNA.
For Bryan, one big advantage would be a break from WWE's cruel schedule. Hey, if the neck and shoulders are good to go, DB is relatively young and extremely fit, so he'd be able to go at it and make that WWE-money. If there's a nagging niggle or if he's in doubt that he'd be able to go full-time, the lighter load did wonders for a former liability like Jeff Hardy and made it possible for a soon-to-be for-real cyborg like Kurt Angle to still be seen on an international stage, despite age and injuries.
With regards to RoH and NJPW, I don't think ego should be a factor (as hard as that is). Don't sign Bryan on a bloated contract just so those guys can't have him, then do fuck-all with him, make him miserable and jump ship anyway for half the price (which is also what WCW did). It's not about having the second biggest dick in the room anymore, it's about survival. Do what you can with what you have or can acquire at a bargain.