Variety is important and I see way too much NG but I've seen a decent spread I feel, I've personally seen Skellige a LOT, on par if not more than monsters. Scoitael and NR are the main two standing out on the low end for me.
Still, I like that they're going through some card tweaks at a pretty quick pace. It'll atleast freshen things up.
Aside from NR, I see everyone get played. It's definitely more monsters (where I am) but scoia has that stupid spell deck and skellige has different variations of a morkvarg thing. NR does have the reaver deck which should kind of work just as well as spell scoia but the reason spell scoia is so good is because that leader they use is spell related and also placed like 19 points on the board.