What OP means is that, if you're going to be paying all your bottom 6/journeyman players a premium of 1-1.5M as a UFA, what are you going to do when good/better players hit the market? That premium will be north of 2M and so you'll essentially be overpaying players by around 25-30% (a number I sorted out of my ass, based on the thinking that a 4M player today would be worth 6M as a UFA, i.e Horton).
The thing that doesn't add up is that, even if the cap floor and cap ceiling are going up, I doubt they can handle the 25-30% raises in salary, leading to many bloated contracts.
In summary, cap is going up, player salary is going up, but player salaries are going up by "too much" relative to the cap (that's my bold statement, I have no proof as of yet, we shall see the consequences in a few years).