To make something a standard you need to win the market first. Not even a sign of that with Tesla which exists entirely because of huge government funding injections. Once that ill practice stops — Tesla is history. So there is no fundamental base for this form factor to become a standard.
All other applications — will they redesign their batteries to make their devices larger when an entire world strives to build smaller gadgets? I guess — not.
Better do a little more reading first. In a couple countries Tesla is the biggest selling car. That's by choice of the people.
Cordless tool manufacturers have embraced the 21700 cell size for their battery packs.