Anything can be overturned with a vote. I don't see how its legal without one, but don't put it passed the dimbulbs to try. Prop 13 is an example. I think they will try to overturn it with out a vote, but I don't see how its legal.
any of the constitution's 11th are reversable with a 3/4 vote of the public. Not to sure about the first 10(bill of rights). However, I believe any attempt to overturn any one of the first 10 would result in bloodshed.