It's worse than "maintain the status quo". It prohibits the state legislature from making any amendments to prop 22 without a 7/8ths majority, and requires any such amendment be "consistent with, and furthers the purpose of" prop 22.
(Excuse me if I'm not quite so read up on this topic—I don't live in California.)
By default, laws enacted via ballot initiatives in California can't be amended by the legislature without voter approval. California has some of the strongest protections for citizen initiatives in the country, which comes with plusses and minuses depending on your perspective.