It's true it was the standard on early Japanese electric stuff (the Leaf mainly), but it's a bit of an exaggeration to say Chademo was some kind of industry standard 10 years ago. Chademo itself is a creation of Japanese auto-makers plus Panasonic/TEPCO. The J1772 as well as of course Tesla's connector have been far, far more common sights in North America over the last 10 years. Western auto-makers have almost completely ignored Chademo altogether.

CCS is a bit larger a connector but not meaningfully so and is just as capable as the Tesla connector feature wise really - can support 350kw DC fast charging and automated payments etc. I'd be pretty happy if Tesla switched the cars over to a standard design like they've done on the Euro cars, assuming reasonable adapters were offered to existing owners.