If Vince is focused on next year he truly is delusional: taker v sting won't fill up a 100k stadium. The whole product isn't hot enough to come close to that number, and nothing short of slashed ticket prices could get close to that number.
WWE is still fully capable of having great TV when they bother to try. They can still have great shows and moments. SummerSlam 2013 was a better show than most WrestleManias. Survivor Series 2014 was great, Dolph had a legitimate star-making performance that should have catapulted him into the main event picture (but didn't, because God Forbid the WWE allows anyone to develop any kind of face momentum that could overshadow the King of Make Me Look Strong Style, as Cesaro, Ambrose, Ryback, Orton, and even Barrett have all found out, after Wade got a great face pop in his return before being turned heel again for no real reason.)
Vince can afford to openly troll his own fanbase and have terrible shows because there's no serious competition to punish him for fucking around like there was years ago. If there was no WCW back in the 1990s, he'd have stuck with Diesel/HBK for a while longer, and then subsequently de-pushed Stone Cold, The Rock, and Mick Foley in favor of Triple H (which he tried to do to some degree anyway.)
The other problem is that the people around Vince generally contribute to the problems rather than mitigate them. It's doubtful Vince watches NXT or scouts any other outside WWE pro wrestlers. That means it's a big problem when people who are involved with the industry provide awful feedback or information, or generally just do awful things, like Mercury and Noble booking the worst Royal Rumble of all time a couple of months ago. Vince probably doesn't even know who Roman Reigns is right now without Triple H. Without Triple H trolling Punk he's probably still in NXT right now. And Triple H just like Vince can't exactly admit when he's wrong or set his ego aside. If he could we'd be seeing Sting/Undertaker instead of Sting/Triple H right now.
If Wrestlemania flops financially or stock prices/live attendance figures crater, he might blink and make a better show, but the problem is most wrestling fans (from hardcore fans to the casual kids) watch for a few guys they like regardless of whatever else is happening on the show. Even if the card is being main evented by an entertainment vacuum that doubles as a spoiled, entitled, delusional real-life prick with no stamina, ring skills, or mic skills, it hasn't hurt business too much yet because Vince has other guys that people like to see (Bryan, Cena, Orton, Rollins, Ambrose, Paige, etc.) Unless those guys leave and Roman is left on his own, they can cover up the flaws in the current WWE business model and the complete failure to build up guys people care about (or capitalize on the momentum of guys when they get rolling.) The show only suffers when there's NO ONE really over with fans that can get people to show up or tune in.
I won't buy WM, and I don't have the network, but I'll probably still watch it anyway somehow just because of Orton and Bryan, just as many people here will watch for Sting/Triple H and Undertaker/Wyatt. And, unfortunately, especially as far as paying customers are concerned, that's exactly why the WWE won't change at the moment. They don't have to.
It's fitting that both the booking philosophy and business strategy of the WWE revolves around the rest of the roster making Roman look better than he actually is. He would crater business if left alone at the top of the card without the actually talented, entertaining guys people wanted to see propping business up further down on the card, enabling Vince and Triple H to give him undeserved credit as being not-awful in his current role.