Pure panic move by WWE. It will backfire for them. Vince should have remained off TV until 2008 at the earliest. There is no doubt that he is the #1 heel in WWE and is (one of) the biggest draw in WWE at the moment, but I don't think this is a smart move. It will obviously improve the Raw rating this week, but it won't benefit the company in the long run.
I don't see why this is even necessary to be honest. Granted, the rating for Raw was terrible last week, but that was just one week. Once Triple H has returned at Summerlsma and Orton *possibly* wins the WWE Title, things will improve dramatically. Add that to interesting storylines (which haven't existed in WWE for a very long time now) and the future will be bright.
Vince returning is not the answer. Also, how exactly is he 'striking back'? Who is he striking back at? Unless he breaks kayfabe and talks about the storyline where he faked his own death and how the Media attacked the company about the Benoit saga, then it will be pointless, imo. But we all know that won't happen.