It's a god damn comic show, people coming back from the dead and turning heel is half the fun.
Is it though? Characters come back from the dead on a regular basis in comic books but because of comic book tv shows being in their infancy I don't know how much we as viewers should or shouldn't expect when it comes from character resurrection.
Also people being brought back from death isn't what most concerns me. What worries me is I think Tommy has nothing left to give to the story (or at least anything good). Characters staying around longer than they should is how you end up in situations like Malcolm Merlyn. I prefer that characters end on a high note rather than lingering for too long becoming a sad pathetic husk of their former selves.
I'm looking at you Captain Lance.