I would not do that trade. He gets Allen, which I am sure is a massive upgrade this year and for a few more, and gives up a QB he might not play more than a few games, and who could very well have a down year given the sate of the team as a whole. Wilson is expendable to him, potentially so are Newton and Mahomes, though probably to a lesser degree.
I agree with your interest in adding a stronger QB, and I would also be looking to take advantage of the situation this team is in with their abundance of quality QBs, but I think you might be able to get them a bit below market if you keep this player engaged. Start by taking a look at the other teams in your league, do any of them have a similar need for a QB? If not, then you have even more bargaining power.
I would steer you towards Newton over Wilson to help you make a run this year, but I wouldn’t be willing to part with Allen to acquire him. If he won’t accept anything less, I would test the waters on Mahomes. A Rivers/Mahomes tandem could be very rewarding this year.