No team is going to let a HOF QB go. The only way to get one is through the draft, and the chances of that happening, even with a high pick are low.
Let's work backwards. What is the goal? It should be to win the Super Bowl. Given that assumption, the question is what QB is capable of getting us there.
If you think he is in the draft, the question becomes what will it cost to get him. Of course, a QB alone will not get you to the Super Bowl. If the player you want costs too much that you can't assemble the complementary pieces, what do you do? Absorb some losing years while you build around him and hope he develops as planned, or pass and look in free agency?
If you are looking in free agency, you obviously want to upgrade the position. Again, you need to look at the cost versus what that cost means as far as sacrificing other positions. You want to pay the least you can so you can build a team while still having a shot at a championship. So, who fits that category. Cousins perhaps, but he won't come cheap so maybe that rules him out. The question then becomes what free agent is better than Taylor. It seems there are a few out there.
My best guess? We sign Alex Smith and draft a QB that falls to us in Round 2.