Any trade that happens will include an extension. It will be part of the deal.
Seriously? has this type of trade happened before? Also, I would think this would be more of a deterrent to the team trading, unless Jimmy would agree to play for well below market value. Do you agree?
I mean would you rather have him with his current contract and you decide what to offer him after you see him in your camp running your system...
If he is playing a high level then offer him the avg NFL starter QB contract...
If he can not pick up the basic concepts and you name Brian Hoyer as the 2017 Starting QB.. then maybe wait until into the season to extend him if at all... You only lose a draft pick.
However
If you give him the 5 year 80MIl contract that I am sure he is going to want then you are stuck with the contract and out draft picks..
Worst case is you wait and he plays like a top 5 QB and he wont take the 5 year 80 mil but wants 5 year 110 mil.. NO PROBLEM!! you have a top 5 QB at market value!