For me, it's all the same, cause i live in belgium. I'm 350~400KM away from Paris and I just have to tell my father to go there with me^^
Anyway, if it's postphoned, it's not the X fault ! They got a problem with tickets ! Of course it sucks ! but how many times have you listened to X and after that, tell yourself the song you were listening to helped you alot?
I believe I've gotta go to see them ! They helped me alot, so I want to help them too (as I can)!
EDIT : My cousin just told me they will do it ! he knows how it is working and he says as X booked Bercy, they will do it even if tickets will go late on sale ^^