The other thing is that agents will plan accordingly. Many players are going to be hesitant to sign long-term deals this offseason, instead opting to wait until next year when they can get more money. Locking players up early in anticipation of the cap rising is a great strategy, but you have to convince the players/agents to agree to it as well. There isn't much incentive for them to sign early (although there is some -- financial security in case of a catastrophic injury, a dollar today being worth more than a dollar a year from now [i.e. investments], etc).
Where we will see the biggest impact of the cap increase is that suddenly the minimum spending level increases by a ton as well, and teams have to throw money at a limited group of FA's just to hit the portion of the cap they have to spend so they don't have to cut the players an extra check at the end of the year.
That is why we are going to see guys trying to get to free agency next year (and the year after) when the cap jumps twice.
Small/Mid market teams will be flooded with with money to spend as teams have to spend 90% of the cap. With a limited number of players in free agency and teams with money burning a hole in their pockets mediocre players are going to get paid.
That is why I expect to see a ton of 1 year deals this off-season.
16-17 summer is going to be a bonanza, but the ensuing lockout after the year will make it likely we never see that next $20 million jump in 17-18. It is why all the players are so locked in on next summer to lock in the huge salaries while they can because the system will change again when the owners lock the players out.