The chances of every EV manufacturer standardising on a single type of electrolyte and delivery method is slim to nil.
Yeah, they used to say that about gasoline back when cars ran on alchohol or lead batteries and gasoline was dumped into rivers because there was no demand for it.
No matter what we think or say today it will be the technology that best serves the market that will become the "standard" in the future. It may even be something we know nothing about today (probably will be).
Back when I was first flying electric model planes it was a challenge to just make them fly at all and then stay up more than a couple of minutes. Now I fly electric models that outperform gas powered models. Years ago I would have thought that to be impossible. Years from now the electric bikes we are riding today will be curious collectors items. They probably won't even be rideable because nobody will have the batteries that they used "back in the old days".
That's what keeps the future exciting!
Trikester