I think the idea is not to promote Amplitube as a toy as it is to
also appeal to a certain audience. There's room for both.
I do not consider AT in particular as a toy - to me it's as good and as bad as the competition. It has its shiny moments, some other aspects are less glorious. But I use it just like I use Pod Farm, Guitar Rig, Waves GTR, Avid's Eleven, Logic's Amp Designer and S-Gear (well I do consider S-Gear a notch above all the aforementioned). The single fact that I own all of these tells a lot I think (well, besides the fact that I'm an addict). I'm not mentioning the collection of cab impulses.
But the point is that it's not less capable than the others. I simply think that anyone who can afford studio time and to record real amps and cabinets still opts for the real thing. Satriani and Hammet weren't putting down AT, in fact, they were talking about Guitar Rig. But I don't think they're all that concerned about brand names. The software isn't as crucial to them as it is to some of us - I don't think they'd agonize over comparisons between AT and GR and others. They use it to cut demos, and don't seem to expect to find one that'll blow them away.
I'm not saying amp sim systematically can't work, simply that, in the long run, getting
that tone can be even more complex than it'd be w/ amps and mics. I've had to rely on them extensively for the last year while on the road and the one thing that became obvious is that it's very easy to get unusable tones out of them - it's probably the easiest thing to achieve actually. It's like each model has it's narrow sweet spot where it sounds relatively close to the actual amp, but twist the knobs around and you loose it.
OTOH, give me even just a little tiny Marshall combo and it'll never sound "bad" no matter how I twist the knobs. The tones are just different and diverse, but it always sound like an amp, and, at least for a Jimmy Page fan, pretty much all of those tones are usable. ;)
Cool discussion by the way.