Try to get as many draft picks as possible, I don't even know who we could trade to get decent draft pick value in return unless we trade our best young players like X Howard, tunsil, or Fitz which we shouldn't do. Not sure what we could get in return for Tannehill. Is Drake expendable? Not sure what we could get for him either. Maybe Reshad Jones could net us a decent draft pick as well. Depending who is available when we pick in the 2019 trading out for 2020 first maybe our only option to gain draft capital for the 2020 draft.
I say we trade tannehill for whatever we can get in terms of draft picks. Draft a rookie QB in round 2 or 3 this year and roll with said rookie, that will ensure us of a high 2020 draft pick.
Panthers did this with Jimmy Clausen and drafted Newton the following year.
I just don't see any other alternative unless we trade or sell the farm for a 2020 QB prospect.