He doesn't need a general campaign. The outrage machine will provide it for him.

I'm more interested by the idea that he will drain other candidates of their funds by gobbling up the RNC coffers.

That might be true, but I am sincerely, genuinely, worried about where the money will come from instead.

This isn't some principled elder statesman we're talking about here. He's not going to pass the hat around, see that it's not enough money, and pass it back saying "well, we tried." No, winning is the only move he's left himself in this obscene farce of a career he's built, and there's no low he won't stoop to in order to get there. He'd sooner put the entire campaign, and by extension The White House, up for sale than lose.