Never going to happen not in a million years. Utterly deluded to think they will be any more "messy" than the anti-Bush protests. It'll very much be an establishment affair, plenty of wanker politicians giving speeches.
While I agree with the second sentence I think there are significant differences between the protests when Bush came and how the anti-Trump protests seem to be shaping up.
First, the Bush protests were part of the anti-war protests which had the potential to feed into something, unfortunately all that promise was pissed up against the wall, but nevertheless at the time there was the idea of something more coming from them. Second, while there was an establishment presence on the Bush protests, you had a very significant proportion of the establishment supporting the war and so the protests were against the powers that be to at least some extent (which feeds back into the fist point).
I hope I'm wrong but I don't see any anti-Trump protest becoming part of something wider or deeper and I would be amazed if it's not shot through with the establishment. Chock full of Labour and LD politicians, maybe even a few Cons.