Running another Legacy League isn't really possible at this point because most past leagues are rolled into the game already. Also, it was designed for when the game had three separate difficulties. The amount of work that would go into creating another Legacy League would be similar to making a new league from scratch.
Having said that, I totally understand that the idea here is simply that we create something easy so we can put more focus on other areas of the game.
I think with Path of Exile 2 in sight it looks like we are taking this opportunity to overhaul a bunch of systems. I'm very wary of saying too much here but yes there are systems we want to rework and old content we want to remove. I've already seen in our plans that there are at least a couple of very old league mechanics that are likely to be retired. In terms of the immediate future, which past content do you feel you'd most like to see reworked?