What you described is more of the good business aspect of some of the re-signings (Scan was a good one w/foresight and allowed him to be motivated up to that point, etc.) There is also the willingness on the player to take a long term deal before their rookie deals expire, or on this new 5th year option that is available, so I know the team can't just lock them up because it makes sense for the org. and not the player (Dez-$). Austin was understandable @ the time, but not coupled with the RW trade. Barber probably did give us his best years leading up to the second contract and understand your point in the incentive aspect for young players to not become complacent, or lazy.
I think it is just as critical as the next to resign your home talent even if you have to let the deals get to that point (for whatever reason), but the PR on these signings has replaced what generally are represented as new FA signings. You're new ingredient to help the team: you're newly resigned favorite player? It was more of just how they like to control the message and it has made an impact on the team not being active in FA. But we resigned all of our good players...all teams try do this? We have Romo, Witten, Scan, and Free as the primary re-signings to point to for longevity in this format (Miles, Barber, Rat, Spencer on the bad end). I know FA would have no good players if that were the case for every team, but that also isn't adding anything to help the current group either. Of course stick with the draft as your primary, but looking to add some talent (even higher risk gambles = $) is part of the process too.