I'll tell you who: fewer and fewer people. His own campaign leaders are bending over backwards to say that he didn't really mean what he said about not conceding, the same way they've been bending over backwards to say that about so many other things he's said the whole campaign long. You think you've been seeing lots of Republicans distancing themselves from Trump up until now? That will be nothing compared to the mass migration away from him if/when he refuses to admit he lost after Hillary stomps him on November 8.
Yes, it's true that up until now, there has been a gracious concession speech by the loser in every single Presidential election -- usually the night of the election, a little while later in 2000 -- after which there is a bunch of talk from both sides about how the other side fought a great campaign but now it's all about bringing the country together, yada yada yada. There might be no gracious concession speech this time and no talk from Trump about everybody getting behind President Clinton, but that will be just one more thing Trump was the first at, one more way in which he makes himself a bigger and bigger jackass, and supportable by fewer and fewer people.
Many pundits have been saying that Trump never wanted to win anyway, and that his real plan is to start a Trump TV New Network. So many pundits have been saying this that if Trump didn't want his own news network a week ago, he might want one now. As far as that having been his plan right from the start -- I'm not totally convinced yet that there is anything in Trump's mind as complex as a plan.
Anyway, if he does start a Trump TV News Network, it will give us all a chance to see how fast a TV news network can go bankrupt.
I hope you all remember just exactly which political party it was which allowed Trump to take it over -- partly, temporarily, but still -- and that you'll all vote the straight Democratic ticket for that reason if for none of the very many other good reasons.