never going to happen
It wouldn't bother me, but then I don't particularly like compartments anyway. I've only ever used them on heritage railways and even then I wasn't really keen.
I don't like the forced intimacy of being shoved in a tiny area with five complete strangers. All well and good if you've got one to yourself, but the prospect of being stuck in the middle seat of three between two boozed up 18 stone blokes with BO straight off the rigs doesn't appeal much.
I can see the appeal being very limited to those who:
1) Could afford the premium for first class
2) Didn't mind sharing with strangers
3) Didn't need a table to working on
4) Didn't have a disability/mobility issue.
I can't see it having mass appeal.
I did tend to find that once I'd claimed the compartment, in most cases I would be left to myself. Similarly, if I saw that the compartment was occupied, I would leave them to it.
I think I benefitted from a lot of people assuming that all compo's were first class, which they weren't.