Don't hold your breath.
Except as provided in this chapter, every contract by which
anyone is restrained from engaging in a lawful profession, trade, or
business of any kind is to that extent void.
The California law does make some exceptions around the selling of a business, but is much more comprehensive than the proposed Massachusetts version, which goes on for several pages and merely requires non-competes not go "beyond that necessary to protect the employer’s legitimate business interests. There's a very informative Web site on this issue at www.prohibitrestrictiveemploymentcovenants.net.