I reject the idea that "political feasibility" can ever be a conversation-ender, especially when put against a true injustice.
Prop 13 (and all other subsidies for special interests) are unjust and unsustainable; they persist due to the support of these special interests (and the indifference of everyone else). With the proper education and elegance, one can hope for a day that we can see through this and implement the right policies.