All a decision like this would mean is: the state of MA has decided it's not in the interests of the state of MA to enforce noncompete clauses, so from here on out it will not enforce them.
You can still sign whatever you want.
I was commenting specifically because I hate sloppy language and sloppy thought: there's just no meaningful sense in which "a particular kind of contract becoming non-enforceable" simplifies into "not being able to sign a particular kind of contract"; the latter implies some kind of intrusive intervention -- a noncompete gestapo slapping pen-from-hand should you try to sign such a contract -- which clearly wouldn't be the case under the proposal.