I live in a weird bubble here in this part of Florida. There are about a dozen vape/head shops in my town. If one goes out of business, a new one pops up. I have enough eliquid supplies to last another 5 years (or more if I start cutting down).
Batteries and wire shouldn't be a problem. If all my mods and tanks crap out, I suppose I can get one of those shops to order one for me through their distributors.
I'll just add, if and when this ship goes down, I don't believe the majority of vapers (besides the ones here on ecf) will know the difference.