I say it is a passing fad. You evidently disagree. We can talk about it all we want, but that will not change the fact that the absolute proof will not come until a few years have past. In any case, I have not suggested that we don't talk about it.
As for what bands are available on vinyl, pretty much everything was at one time available on vinyl, yet people have mostly chosen other formats. A resurgence of sales has not altered that fact. And, since there is currently an increased interest in vinyl, it makes good business sense to have things available in that format, if it is expected to sell enough to be profitable. The music industry is just that, an industry, and their decisions are largely based upon what will make them the most money. They don't care whether one is buying LPs, CDs, SACDs, DVD-Audios, cassettes, 45s, 78s, or any other format. What they care about is people buying it, whatever it is, and they make things according to their expectations about what people will buy. And they want you to buy new, not used, so if there are enough people buying an old format, then they will be happy to make money off of them just like they are happy making money off of newer formats. If they did not make vinyl, the vinyl lovers would be buying used, which would not be getting them any more money. That is the worst possible outcome for them. I would expect vinyl manufacture to track the expected sales of the format, just like all of the others. The exception to this would be a company that is trying to push a format because they own some special rights to it and therefore have an interest in its success, but otherwise, they will make what they think will sell, and nothing else.