I think the quality of what's out there overall is outstanding. I listened to Line 6, Fractal and Kemper before making my purchase and found Kemper and Fractal equal in tone with Line 6 coming in behind them, but only slightly. Great tones all around.
For me, the biggest selling point of the Kemper (before I actually got one and saw the constant free OS and other software updates) was the difference in approach. Modelers try to emulate an actual amp, with a goal of letting you do everything with a model that you could do with an actual amp. A profile, on the other hand, is a snapshot of a single tone. While plenty of room to tweak it, those are two very different things.
I've never enjoyed dialing in tones as I'm constantly dissatisfied with my results, so using profiles from other people who are better at it than I am was appealing. If I was a guy who really loved sound design, Fractal probably would have been the choice.
The Quad is doing the profile approach, and there's no shortage of other modelers out there, both physical and software. And as nightlight pointed out, there are lots of great guitar builders these days, not to mention it being something of a golden age for stomp box pedals.
When I first started out in the 70s, there was Gibson and Fender, and with few exceptions pretty much everything else was crap. Same with amps, you had Fenders and Marshalls and Voxes (oh, my!), and then, well, mostly crap. These days there's just a staggering array of choices out there for musical gear and while I'm sure some of it is still crap, the overwhelming majority of it is pro quality stuff. And much of it is absolutely stellar.
Fortunately, it's not a zero sum game. I don't think brand X has to suck in order for me to like brand Y, or even Z. I like the profile approach versus modelers. Others prefer exactly the opposite. The PRS is the first non Gibson / Fender electric I've owned since my first Strat in the 70s, but probably out of habit and tradition more than anything else. I have no doubt all those other guitars rock just as hard.
Quad is taking a swing at Kemper's approach, and others may do the same. There may also be future mashups of modelers / profilers (if there aren't already). That said, I'm very happy with my Kemper and the reduced level of GAS in my life just because of what it does. However, having been a Kemper customer and a part of this community for a couple of years, I think the way they do business and support their products, along with an unusually positive and helpful group of guys here (you all know you're oddities in the Internet Animal Kingdom, right?), creates a significant market advantage. Others could replicate that level of support, to be sure, but I haven't seen it so far.
And yet, I still enjoy watching videos of other guitars, other pedals, and other amps / sims / models / profilers / etc. It's kinda like going to the race track and just betting on paper without actually spending any money.