At this point, the stock is clearly going nowhere but down, so even resting hopes on the existence of ‘greater fools’ to raise stock prices would seem to require some degree of faith in Trump.
There’s certainly been that dynamic all along, coming into play at key points, and it will surely come into play when Trump wants to sell his shares, but I can’t imagine it’s keeping his stock prices up in the meantime. Right now there’s a lot of different people spending money on stocks, with no real benefit for Trump.