I think you should LP whatever interests you. Sure Minecraft LPs are overdone (and they kinda never end), but if you like playing Minecraft a lot, then I don't see why not. One of the mistakes I made in LPing was choosing a game that I wasn't interested in, but was going to be a unique LP because of how little-known the game was. (Luigi's Mansion doesn't count, I actually like that game, it was my previous LP that was bad) In the end, I lost interest in LPing the game and stopped it.
Overall, if you really like playing Minecraft and you always have the
interest to LP it, then I would say go for it.
People should LP what they want and not look at what's overdone/underdone in my opinion.