I always envisioned making a salary floor, at least from an online league perspective, by just saying that you had to spend X $s by the end of the year and whatever you didn't spend up to that was taken away from you and put into revenue sharing or whatever. It may not be as elegant as something more complex, but simple often works well enough.
Programming the AI to actually be smart spending up to the floor for a solo league might be difficult, but most likely not impossible. I suppose it may not be so different as making it be smart enough spending wisely when just under the salary cap. I've never really looked at that to form an opinion of whether the game is smart with respect to the cap though.
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