Wise decision to wait until summer since few heavyweight options are available or willing to enter into a project mid-season. Only someone from within the club could do so, hence Xavi
Plus, there will be turnovers in summer providing more options to the Glazers. Pochettino makes the most sense although has to be acknowledged he has yet to demonstrate he is a winning coach. Zidane, IMHO, is a lock to take over at the Qatari club
As for United, their season is thrown into disarray now with a caretaker coach - 9 seasons post Fergie, they are still far from being the best in football much less in their own city