I wonder how many are usually non voters. And how many traditional voters will stay home due to the choices.
Trump is a polarizing figure. His presence will likely cause a spike in voting by anybody-but-trump voters, and many traditional Republicans will stay home. The question is whether he will be able to get these lazy non voters to the polls, which in turn will depend a lot on how good of a ground game he can run, and how well funded his campaign will be.
Without a doubt Clinton will run a top notch ground game, and she has done a massive amount of fundraising to hire campaign workers to execute it and media buys to promote it.
Trump on the other hand, so far, is way behind in his ground game. He doesn't have a campaign organization to speak of and he is WAAAAAY behind in fundraising.
And no, he doesn't have the cash to self fund. He will need around a billion dollars to compete with Hillary and he doesn't seem to have that much free cash, not unless he starts a firesale of his business assets.
He still has six months to fix that, but as of now he has done hardly anything about it and doesn't seem to think it's important. He got mad when he lost some primaries to a superior ground game, but he doesn't seem to have learned how to do that himself.
The general election requires a lot more organization than the primaries and it remains to be seen whether he can get an effective organization together.