Feel uneasy about treating De Gea this way he's been outstanding for us this season on and off the pitch, one of the very few players that deserves to be at the club in my opinion.
Signing is all about keeping an eye for the future. Not every GK would continue to stay at high level till 40, and DDG will turn 32 in November.
For the quoted price, this looks like a great planning for whoever at the club to push forward this deal. Getting GK prospect before their value inflate. He's very young for GK, so there may be enough room for kicking, distribution improvement