From what I've read surrounding this 'saga' Frenkie himself has no interest in joining United despite ETH (no CL will really fuck them in recruitment) and Barca, happy to sell him, are using United to drum up interest so a top CL club comes in and Frenkie is open to join them, win-win. problem is, only United are interested in him at this stage so I think it's se queda.
Also, United aren't stupid anymore so the 90mil+ is not going to happen. They have a 120mil budget apparently and need to recruitfor more than just midfield.
since we signed the CVC deal, if we are still hell bent on forcing him to leave then it really shows Xavi just doesn't rate him.