Theory won't be a dead champion. Or at least WWE won't recognize it. They see him as the next Miz and they gonna push him down people's throats because they feel like they did everything right with Miz. Comparing Theory to Big E makes almost no sense, because WWE didn't put the work and trust into E in the first place. You can see the difference already, with how they treat Theory.
I mean, I'm happy if I'm wrong, because Theory is alright enough, but Miz needed years to develop into the actual great asset he is nowadays and I don't think anyone want a repeat of his original big push/WWE title run.