I agree, most fights end up on the ground, and that is what jiujitsu is optimized for.

Most fights where it's two guys going at it while bunch of other guys stand around yeah ...

In the real world, if you want something really effective without any pretensions to being a sport or an art or anything, do Krav Maga.

I’ve done Krav for years, and while the principles are strong the lack of sparring makes it nearly useless in most real combat situations. For example, we’ll drill kicking someone in the groin repeatedly on pads but ignore the fact that it’s actually really, really hard to land a kick to the groin of a resisting opponent. I’m glad that I have the striking experience I’ve picked up from Krav, but I’d trust my jiu jitsu training way more in a real fight.

It's a key factor - if you are fighting more than one person then you don't want to go to ground!