I think it's very unlikely. Trump primarily appeals to a certain (admittedly, not insignificant) extreme opinion, and it's hard to see him generalising that appeal across the nation. At the moment I've been a little bit dismayed to see his support in polls not collapsing, as Ben Carson's has. On the other hand, it's virtually flatlined for the last month or so in the high 30s, so if the ridiculously large field of alternative candidates starts to shrink, someone may be able to grab that majority. Or perhaps not. But even so, how can Trump be expected to appeal to the majority of less polarised Americans? I don't see that it's remotely feasible. And, if it is, I think we should all be scared of what follows.