I think there's a baby/bathwater situation here. DLR is more than just inverting/spinning stuff, and has tons of sweep opportunities. For example, here is a good example of some non-spinny DLR stuff. It's also Roger
Also I believe Ricardo DLR himself made a second go at competing when he was older, and put up respectable results.
I've thought a lot about this perspective. When I was younger I was really into Kung Fu, and I was greatly worried about having a skillset that would age well with time. For that reason I started pursuing Chen Taijiquan (yes, yes, I was young, silly, and full of dreams). I ran into an older chinese instructor who wanted to know why I was training Taijiquan, and I told him it was to have a skillset I could use when I was 75. He was shocked. He told me to go train some crazy acrobatic style and to enjoy youth while I had it! His view was that once I wasn't able to do those moves any more, then I could have something new to learn when I was older; but until then, while I could do it, live a little. He also pointed out that I'd probably get bored of doing the same thing for 50+ years, which was valid. And that there's a point of diminishing returns; we can only keep polishing something so much before it's as good as it will get.
It made sense at the time. Most of us enjoy BJJ because there's so much to learn; the worst periods in my training where when I wasn't learning anything. I doubt this is going to change by the time I'm 75. Why not train the crazy things while I've got the body to do it? Sure, if it's physically harming me I shouldn't do it (there's a right and wrong way to invert, for instance). But otherwise, if I only have so many years of breakdancing on people in me, I should enjoy it while I can. Whether I spend 20 years or 40 years working on cross chokes, I don't know if that'll make a huge difference. Maybe I'll be regretting this in the 70+ year old Masters Tournaments when I can't cross choke for shit.
Plus, you guys may not get bored of doing the same exact game plan and moves for the next 50+ years like I would. Keeping up with what all the youngsters are up to these days is kind of fun, though.