You CLEARLY do not want a WWE Network Special, you want an NXT Takeover event with a few WWE guys thrown in
Yeah, that's the feeling that I get.
An NXT Takeover special is fine, but a cross company show isn't gonna happen right now. The only shot some sort of roster wars card goes down is if NXT continues to grow, though all signs seem to suggest it will. NXT is becoming bigger than simply WWE's developmental territory, though it's primary goal is still to help produce wrestlers to make it to the main roster and that objective is unlikely to change in the foreseeable future.
MAYBE, JUST MAYBE in 5 years or so, this is something that could go down, but not right now. From the perspective of WWE management, and rightly so, the main roster is & always should be the primary objective because that's where the money is generated.
Enzo Amore and Colin Cassidy vs The New Day vs The Usos vs Blake and Murphy vs The Vaudevillains vs Prime Time Players vs The Lucha Dragons vs The Dudleys in a 8 Team TLC Match - I think this is too many teams. There'd be so much going on during the match between these competitors that it's just too much to cover. Whittle it down to just 3 or 4 teams and it'll be still be the chaotic spotfest you'd be hoping for, but a controlled chaos that isn't a clusterfuck waiting to happen.
Cesaro vs Chris Jericho - This could be a fun match, though I'd be more likely to put Jericho up against a heel, someone for fans to root against.
Rhyno vs Seth Rollins - This would be a waste of Seth Rollins. Rhyno is a nobody in the grand scheme of things; his glory days were in ECW 15+ years ago and he's milked it for all he can, but this guy shouldn't be against the guy who's both WWE World and United States Champion. Something that'd draw, more than likely, would be a champ vs. champ match with Rollins taking on Finn Balor. It strikes me as extremely weird that every other NXT champ is involved with this fantasy card except the guy carrying NXT's main event title, which should probably close out the show.
Bayley vs Paige vs Charlotte vs Sasha Banks - As Paige & Charlotte are currently allies, this doesn't make sense really. Bayley & Sasha tore the house down at the Brooklyn Takeover special, just give them 30 minutes or so and watch them do it again.
Bray Wyatt vs Brock Lesnar (then immediately after, a few suplexes and an F5 to Luke Harper and Braun Strowman) - So, you want to see Brock Lesnar decimate the entire Wyatt Family and obliterate any momentum they have? Bray Wyatt still hasn't completely recovered from the questionable booking he got during his feud with Cena, so you want to set him back even more? No...just...just no. Feed Lesnar a buncha jobbers all at once like Zack Ryder, R-Truth, Adam Rose, Bo Dallas & Fandango and let him decimate those guys. People will still get the thrill of seeing Lesnar crush a buncha guys.
Sami Zayn vs Randy Orton - Zayn's a talented guy, but I have to question his ability to stay healthy. Much as we've seen with Daniel Bryan, unfortunately, Zayn looks to have become severely injury prone as of late and I'll be extremely surprised if there aren't questions among WWE management about his potential future with the company.
and the main event
Samoa Joe vs John Cena - For some reason, this match doesn't interest me all that much. It may very well be one of those things where it's an absolutely awesome match that I wasn't expecting much from. I wouldn't put it as the main event though.
If, by some miracle, this card did go down, the downside would a strong likelihood that most of the main roster talent pull out a win. The perception of management, and some fans at that, is that NXT is the "minor leagues", comparatively speaking. For instance, I don't see the NXT Champion defeating the current WWE World & United States Champion, nor do I see Samoa Joe going over John Cena in their first bout, at least not without Joe being on the main roster.