Not a lot of point second guessing anything too much in fairness (which I've been guilty of myself).
In terms of the clubs that may be in for him, money talks, so whether it's City, PSG, United or whoever as long as the bid tabled matches the club's valuation it will be accepted.
Hard to know how Grealish would respond, totally on him, he may see United as very appealing he may not. He may want to remain here given he's a fan, he may not and see playing for a club much further up the table and in Europe as more appealing.
The beauty is that we will find out soon, the summer isn't far away and clubs absolutely 100% will be making concrete bids for him. The only clear circumstance for me is relegation, if we go down he will definitely be gone.