This thread is a bit confusing because the OP seems to simultaneously understand and not have a clue how the mind set of hardcore internet fans work.
The problem with relying entirely on outside indie talent, the way many of the hardcore net fans would prefer, is that the bodies of some of these are just plain worn out. A lot of these guys have killed themselves out there on the indie scene by putting their bodies through hell via insane spots because that's a huge part of the bread and butter of these guys out on the indie circuit. Ever notice how so many ROH matches seem to have this insane, nonstop pace in their matches that're packed with spots with hardly any storytelling or selling? That's usually how the indie scene as a whole works and it can result in wrestlers burning themselves out just as surely as the WWE's schedule. Part of the reason why WWE puts more emphasis on storytelling and selling rather than these insane paces and spots is because the wrestlers would be lucky to last a year before their bodies gave out, given WWE's intensive tour schedule; it's a big reason why the wrestlers are "limited" or their move sets aren't as expanded as they could be. It's one thing wrestling a maybe 3 or 4 times a month and wrestling 5 days or so out of the week, every week,
As for the notion of having only guys like Cena or Orton challenge for the WWE World Championship, this is where I get confused. It's as if the OP hasn't been watching WWE for the past several years and hasn't seen the sort of reaction of the fans when the likes of CM Punk or Daniel Bryan haven't gotten shots at the main event. It's not just "internet fans" who're believe that the title shouldn't be only for the 250 pound or more club; I think most fans don't give a damn if the wrestler is homegrown or an indie darling so long as he has the talent and the ability to keep them interested in what he's doing. The problem most fans have, in my opinion, is that so many of these more talented and interesting guys are guys who either aren't part of the 250 pound or more club or who don't have the cosmetic "look" that Vince McMahon seems to prize more than most other factors. Over the last 15 years or so, I'd say that probably a good 75% of the most talented wrestlers who've been debuting in professional wrestling, in terms of in-ring ability, personality, charisma, etc. have been guys who're generally within the 5'8" to 6'0" height range and 180 to 220 pound weight range. Compared to big stars of the past like Hogan, Sting, Warrior, Sid & Nash and more modern stars like Cena, Lesnar, Sheamus & Reigns, most of the more talented, emerging stars are physically much smaller and don't have the sort of Herculean physique of the larger guys.
The thing is, however, that the mind set of WWE will have no choice but to change because the success of NXT and its growth have dramatically altered the way WWE scouts talent to sign who've had experience as wrestlers and talent whom they hope to build from the ground up. Vince may prefer larger guys in the top spot but Vince won't be around forever and if Triple H is pegged to ultimately take his place, it's pretty obvious that he has a different sort of mind set than Vince and is more in tune with the mind set of modern fans. Vince is stubbornly holding into some old ideals and are become more obsolete with each passing year when it comes to the sort of cosmetic image top should have.
Now that isn't to say that bigger guys aren't talented, that's just crap. There are a lot of larger guys, yes guys with great physiques, who have a lot of ability and have demonstrated said ability time & time again. There are some hardcore internet fans, however, who would rather die than admit to such a thing and really go so far as to be downright prejudiced against guys well north of 6'0" and really well built. As I said, I don't think most fans genuinely care so long as the wrestler has talent, keeps them interested and feels fresh; the problem stems from the fact that, in the minds of most fans, there are guys currently on the roster, and who have been on the roster for a while, who're flat out more talented and entertaining than the guys who've been getting pushed to the main event spots and most of these "more talented and entertaining" wrestlers happen to be guys who're under, right at or just slightly over the 220 pound mark