I edited for more clarity :
In my opinion, They are many problems.
- spoilers (which aren't really a problem)
- fans mentality
- WWE slow adaptation
- Recycling of gimmicks, storylines, finishers :
- use of jobbing
Even if a fan doesn't read spoilers, he is spoiled by friends or surrounded by unhappy fans who read them and thus influenced.
One good way would be to forbid spoilers and spoiling websites or to attempt to keep the collaborators quiet about the business. We can see that big events can still shock even if we know about them (Booker T and Nash in the rumble). So spoilers aren't the biggest problems.
Mentality Evolution and adaptation :
But it can't change the evolution of mentality towards credibility and realism, evolution influenced by modern martial arts and MMA. Yes the fans even if they don't watch MMA are influenced by it and search credibility and realism. WWE has to adapt for example modifying the comments to add a more sportive and professionnal feeling.
Recycling of gimmicks, storylines, finishers :
This lack is part of the adaptation problem. WWE is desperately trying to create new recipes to keep fans attracted and to attract new ones. It creates a lot of generic/unattractive gimmicks and a few pearls coming mainly from the Indys or from outside WWE.
WWE is currently unable to completely create new ones, but fortunately it slowly evolves.
Lack of emotionaly attaching wrestlers and jobbing :
The main and real problem is the fact that fans nowadays have only a few wrestlers to mark out. We can't find many wrestlers to be emotionnally attached/rooted with. It forces WWE to revolve around 5 big names and renders storylines uncomplete or too easy to figure out or to guess.
A good way could be to add new mid-eventers and main-eventers. WWE could also try to finish using jobbing as a storyline practice (it was the case in the old times when pro-wrestling was at its peak).