Well, asking a bunch of legislators to vote for something that is very much against their self-interest is a very difficult task. One needs to either gain tremendous leverage over them, or try a different path. I feel that the Executive and Legislative Branches need to tell the Judiciary to stuff it when they come up with their outrageous 'decisions'. That would make a good start. As far as leverage goes, currently most Reps have safe seats, so that would have to change -- by de-gerrymandering districts via new rules limiting the length of perimeter a district could have compared with its square-root area, perhaps.
Tax prognostications and now political analysis all wrapped into one fuzzball. That's great.
You don't think the politician's "self-interest" includes getting re-elected, then??? They all have such safe seats they can just ignore voters??? Got news for you pitipat.
That alone should tell that the idea is worthy of support -- that lawmakers are against it for not being in their self interest. Remember, they are supposed to be there to serve us.