I expect to see the the salary cap actually decrease some rather than increase. I expect to see a combination of rookie contract maximums as well as a lower increase than usual for existing players. Huge contracts could have a crippling effect on a team's overall cap (during the Colts game I heard them say the Colts could expext to have 15% of their cap tied up in Manning alone). It isn't going to limit the contracts individually, but it is likely to change how teams sign players to them.
Pure speculation though.
I strongly doubt it.
I have not heard that any owners are pushing for that. The union would certainly oppose it. Nor would it make a whole lot of sense. If the Colts feel Manning is worth 15% of the team's payroll, that is their business. If they don't that is their business too. Manning is FA this year. Some team is going to pay him what they feel he is worth.
Also the net affect of having such a system would harm parity. Of all the sports, the NFL has the best system for parity, and while each individual team does its best to maximize itself there are several things that keeps the teams roughly equal. One of which is each team has a maximum number of dollars and can use that money to bid for the FA the team feels represents the best value.
Lets for a moment assume we have an individual cap on players. In order to it not to be pointless it means that it is lower than some players would be worth on the open market. Lets say we have a player is worth to multiple teams more than his max salary. Where is he going to play? New England? New Orleans? Atlanta? etc.-- All possible candidates, every team is going to pay him the max salary, why not go where I got a shot at a ring. Locations to be avoided -- Carolina, Miami, Oakland, Buffalo, etc. So the net result would be diminished parity.