I think 510 is here to stay, smaller numbers than it was in the golden age, most of the last 2 years have been about pod, disposables and boro.
Disposables are going away, more or less, for natural reasons, pod is taking over that market,
Then there are still Chinese brands that now and then launch an rta, such as Cthulhu and Innokin.
At the high end it has been pretty good with new rta, Atmizoo Tripod v2 and Aer, Svoemesto had Kayfun X, Steampipes is working on a new rta&rdta, Hussar is launching a new rta just now.
Then there are some slightly newer brands such as Arcana, Centenary, which in terms of price are in the middle.
Mod wice, on the high end it's okay, a lot of boro, but it also drops out some 510 mods, a year ago dicodes Qi, now dani micro 18500.
Evolv is working on launching DNA 60C, and DNA 80C to the boro world.
There is one Chinese high end that regularly comes with 510 mods.
However, there is a smaller number of mod makers.
When the Chinese get done with disposables, or that is to say, it looks like Europe gets done with them, they will produce something they usually did before, i.e. pods, 510 and what everyone is talking about today boro.
510 doesn't die out, the day it does vaping is dead too