I guess whatever folks want, but I'd say we only go for a year. But given that we haven't completed a year, I guess it's a little pre-mature to worry about it.
With the actual CBA rules, guys who are over the cap can't sign FAs and trades have to be within 25%, etc. That seems like a tough penalty to begin with. If our players become FAs when their contracts run out, in sync with real life, then we have that to consider when dealing with/for players.
I picture us still using exceptions. So if you're over the salary cap, then you can 1. Re-sign your own players. 2. Use your MLE, the BAE, sign your draft picks, and sign guys for the minimum. 3. I propose we use the luxury tax level as a hard(er) cap. Unless you were in the final four the previous year, you cannot exceed the luxury tax like to re-sign your own FAs and you cannot use your MLE or BAE. I'd still let folks sign their draft picks and any minimum salary guys they need to flesh out their rosters. At least to me, that seems to create a good compromise that will encourage people to pay attention to finances but make things completely impossible to deal with or unrealistic.