I think the sets are about 15 years in service now, a refresh would probably be welcome, add power sockets, wifi and whatnot, finally finish the generating van project so Enterprise liveried 201s wouldn't be found "having a rest" down south and so on.
A refit would involve pulling the existing trains from service at least piecemeal but there's always the Gatwick set to step in which NIR *insist* are still part of the service fleet
