In 50 years, my favourite prediction is we'll understand what happened at the beginning of the universe. I don't see any obstacles to doing it, except that it's hard, right? Except that we don't hav any direct information,. because the information about whatever happened at the very start of the universe is sort of a transformed overtime you know, rubbed out by either inflation or the micro background or whatever. In principle, this is like when people ask me, you know, in 50 years, what is the most amazing thing you think will happen?