Is the Vinyl Revival well and growing?

Unless they start recording in analog again, there will be no true and long lasting revival. Most likely vinyl will disappear in a couple of decades. Of course, there will probably always be people who are into it, and tape, and tubes. Just like in other areas. Digital does sound better on vinyl, but it's all BS, nonetheless, computers should be able to overtake in terms of sound quality soon. But they will not overtake good analog.
In any case, talented musicians are more important than all that.

Most new vinyl is sourced from digital copies of the master tapes (if analog tape was even used at all). So why bother, get a CD instead! That's why I always will buy original pressings - even if condition isn't the best. Going into the Future there will always be LP enthusiasts!

No-one knows for how long even the best pressing under optimal conditions can survive. 200 years? 300 years? Whatever you do, any way you try to copy analog, without any digital interference, there is the end. Replicative fading. 

Wax cylinders?
.....nnnnNo

'Good' vinyl LPs'.....will last as long as the entity playing it on a Decent TT with a cart that's not running major grams & miserable compliance?
...and knows how to handle an LP with a certain level of TLC?
Yes.  Some recordings ought to make it into the 24th Century....in fact, deserve to.

(Ex., "Star Trek:Beyond"; the 'Beastie Boys' segment made me laugh...
"Is that music?!"

My response:
"Oh, 'ell, No.  A weapon of mass distortion..."
*volume to 12*)

When all we had was vinyl some of that was to be expected at the level of equipment I had available so I never thought anything of it. (Would cleaning help that? I don't know.) My point in all this is that if that is not acceptable I would be reticent to buy more used vinyl at those prices as it seems like a gamble.

@n80,
Typically a thorough cleaning, specifically inside the grooves, removes noise plus many of the clicks and pops. Since these are used records with unknown history, results will always vary. But cleaning is a must and will make a record sound better (unless it's damaged).

Years ago I also thought that clicks and pops were part of the vinyl experience. I was led to believe all I needed was my trusty Discwasher brush.