MoonSong
Rules-lawyering drama queen but not a munchkin
What? NO!
Don't want to get involved in the Sorcerer discussion, but the Monk?
Look, if you happen to like Monks, the 5e Monk is perfect. In fact, as a true Monk fan, I would say that 5e is the first edition that really got the Monk right.
The Open Hand Monk is just about perfect. I would argue that, in terms of design, it might be the best realized archetype in 5e.
Shadow is also an excellent example of how to do a flavorful variation. It is a great ninja.
So, they didn't do a great avatar monk, but that's because (again, IMHO) the Monk ki-chassis isn't great for spellcasting. But ... who cares?
To the extent that the Monk doesn't do well in popularity surveys, I would say it's not because of class design (which is amazing) but just because some people don't like Monks in their D&D. If you don't like the 5e Monk, your issue isn't the class design, your issue (again, IMO) is the Monk class.
Don't take me too seriously, but I don't think we'll be seeing any new revised class anytime soon. Ranger will take its time, then the natural followup is the sorcerer, should the designers ever recognize sorcerer is in need of help. And that isn't happening with all the new subclasses that we (I) expect in the near future. No matter how much I desire it and advocate for it, I know it isn't happening. Then if the planets align and a pig flies and that ever happens, that is at least three more years. And even then the next one by popularity would be monk, and monk is quite solid, but let's say that also happens by a weird twist of fortune, we are talking at least seven years before fighter is even on the table.