I'm gonna disagree with this and here's why.
A better plan would get to try to build up a good team around QB and then when you can get that golden armed Franchise QB, you plug him in and go. That's what the Saints did. They were pretty much a little .500 with Brooks or whoever it was at QB for a few years. Then they traded for Brees and ere ready.
The Seahawks did pre much the same. Floated at 7-9 with Tarvaris Jackson for a couple of years while they acquired talent like Earl, Sherman, Sidney Rice etc.. Then RW shows up and it was off to the races.
Doing as you suggest would result in something like the Houston Texans with David Carr.