I kinda think it is the opposite. It is the high salaries that drove teams to put the high paid QB's in early - the owner didn't like to see his high paid QB hold a clip board, and then finally get good and sign somewhere else as a FA.
But now, coaches have the higher pressure to win NOW. So they are stuck in the position of wanting to please the owner by playing the high paid player, but not getting any time to build the team and develop the young players. But the coaches are starting to lean toward playing it safe today to keep a job, and worry about tomorrow later.
starting rookie QB's is a double edged sword. If they sit for a couple of years and carry the clipboard with a solid starter in front of them on a winning team, great. But if a "phenom" rookie prospect is carrying the clipboard behind a mediocre at best QB on a losing team, the organization and its fanbase want to see what they have invested such a high pick and millions of dollars can do on the field. Take Aaron Rodgers, he had the luxury of sitting behind quite possibly the best QB the NFL has seen all-time to learn his trade and study the offense. Thus far, it is looking like the Packers knew what they were doing, as Rodgers has had a lot of success in the first couple of weeks. However you also have situations like Peyton Manning and Aikman, where they were thrown into the fire early , took their lumps, and matured early on. I think it depends on the maturity level of the particular QB in question, along with his ability to learn the system and how quickly he can read defenses in the NFL to determine if he is ready or not. In some cases (David Carr) the guy may just not be what he was hyped to be in the 1st place. The fans and organization want to see what these rookie QB's can do, but it would be in the best interest of most of these teams to deal with some criticism from your fanbase for a couple of years to protect your investment and maybe deal with some losing until you think that the guy has enough confidence to deal with NFL defenses, criticism, and pressure.