abirdcall
(she/her)
What is someone did a Kickstarter? Also, I do not agree that its a guaranteed money loss.
Right, then we're not talking about WotC.
As has been said, DM's Guild or 3rd party publishers in general are your best bet here.
I'm sure you could find someone doing a small scale project out of it.
WotC won't though. Only one adventure currently supports levels 16-20. There is a lot of room for support for those upper levels but there probably isn't the demand for it. I imagine we will continue to see a trickle of support for 16+, basically every now and then as they saturate the lower levels.
The demand for 21+ is minuscule. I don't think it will ever happen.