I agree with you.
The berimbolo and RDLR are great and I use them, but a large part of their popularity is to do with how much people dedicate themselves to it (relative to other things).
I feel this way about the closed guard. When people knock it and I defend it, people cite "nobody uses it!" as a counter argument. But it's simply not popular, so sure.. fewer people are studying it with the intensity and passion that they're studying berimbolos and subsequently fewer guys use it with the success of RDLR and spider-esque guards.
Guys like Kron, Calasans, Braulio, and Roger use it, but overall it's not popular.
I personally study it like a motherf*cker and have great success with it. Same goes for butterfly.
In grappling it seems like things come in waves and IMO the best way to be 'innovative' is to take a look at the things that are being neglected or forgotten at this particular time.. and then become a master of them.
tl;dr You're right. Just because it's not used by a lot of people right now, doesn't mean you should neglect it.