They seem to be doing well enough to stay in production. They're not going to fly out the door as a cheap alternative - there's very little price difference. But I wouldn't be entirely surprised if they did start to catch on more broadly. It'll be interesting. I suspect there are a lot more ofc them out there being used on the road than we're aware of. You know the drill - established acts / operations who've had enough of the weight / hassle of a tube amp on tour, these look close enough the average punter isn't gonig to notice.... (on some scenes, the look is as important as the sound. I've seen acts get dismissed on certain scenes for not having the right look - can be especially so on the rockabilly scene where a lot of acts put out vinyl because some of their fanbase won't buy CDs). Younger kids now seem to have come up with a range of new bands that have gone beyond the "tube good, else bad" mindset, so we'll see what they go for.
If that's amps at all, that is. We've speculated on this elsewhere on this site as well, but it's not unthinkable that amps as we know them could be out-evolved by alternatives. PAs now are better and cheaper than ever before. The old, macho idea of The Big Amp comes from the days hen you needed that be heard and PAS weren't great. That's no longer the case. I've seen a number of acts recently who used pedal format pre and power amps on footboards, and plugged right into the PA. In the West End musicals in London, a lot of the guitar players have been using stuff like Line 6 Pods for years (when Buddy was last in town, they had empty cabs out front for the look, and were all hooked up to Line 6 pods out of sight). Maybe if younger bands and their audiences get past certain visual expectations, we'll see bands arrive with pedalboards under their arms, and set-up / tear down becoming vastly quicker for everyone. If it still sounds great, I'm not at all opposed to it. My own next move no is, I think, gonig to be a small pedal board with pedals for reverb, gain, preamp, into an A/B box that leads to a headphone pedal amp and a Mooer Baby Bomb preamp. Thinking of tying one of those tweed JHS Vintage 1x12" cabs at about £100 with that, could end up being a solid rig for me as a home player. In the unlikely event I ever played out again, the cab could then go or not depending on availability of monitors. I could see that becoming a norm. The tech is already there - it just needs to convince guitar players who have a tendency to luddism.