Well, we just got a 4 man EX fight It's def within the realm of possibilities now.
I'd personally would be down for a 8 man dungeon or something a bit more
harder (not so much EX lvl, but maybe 24 man lvl of difficulty?)

The problem is, people tend to not like it when SE get's too "experimental".
And that's not even a BD5 (? I forget which BD FFXIV belongs to) issue- People really dont like when Square enix,
as a whole, tries out new stuff. Ever. Not since I joined the fandom in 2003 (and apparently predating even then).
I cant blame them for being cautious with new and unexplored territory.

I kinda hope they continue to experiment tho. Really like rathalos, and I'd like to have an actual reason to do
Dungeons. Because, I'll be honest, aside from doing the dungeon once for msq, I stopped doing them about a year ago
And just do pvp or 24 man for tomes, lol.