Until this court, there hadn't been such egregious and reckless displays of bribery at the highest court, so there was no need for this before.
I could understand to some level not liking the term limits, as that is arguably more partisan (although not directly partisan, simply saying "each President should have equal opportunity to fill the benches"). But how you could argue that the supreme court being forced to abide by the simplest code of ethics that every other high level appointment needs to abide by is very rich.