I'm a regular traveller and I value privacy and personal space, but there's several reasons I wouldn't want to go back to compartments, and I think their days have been and gone.
They're great if you're on a lightly loaded train, but being squeezed in with seven strangers in close proximity is gruesomely claustrophobic, and far less preferable to an airline seat, where at most you might sit next to one other person. It's also very difficult to provide tables.
Antisocial behaviour is likely to be a much bigger issue, both things like feet on seats and playing crappy music on phones, right up to much more serious things like mugging, assault and sexual harassment. We don't need to do anything to encourage these things! Open layouts are much more secure and provide far less scope for this sort of thing to happen. With all due respect, the vast majority of people commenting here are older males who have far less to fear from a safety perspective than young women do. For them, a compartment is just asking for trouble and it will effectively exclude them from the carriage. You can say "but provide open coaches too", but what if the only room is in a compartment that has one solitary male in it? Would you sit in it? I certainly wouldn't.