Geddy Lee doesn't even use on-stage amplification any longer... he uses a DI and in-ears and calls it good. Just because something has been the way it is doesn't mean it needs to stay that way. Tubes are cool, and if you want to haul your SVT (or other tube amp) then more power to you. Plenty of pros are now using other amps, because they don't have to be confined to tube amps, in most cases tube pre's are sufficient.
This is like the old vinyl vs. CD or MP3 argument. Sure, back in the day, CDs were colder than vinyl, and MP3 even more so. However, as the tech grew, most folks settled on FLAC (aka "lossless") as having the superior fidelity yet enough of the warmth of vinyl. When SS amps first came out it was much the same, but the tech has grown, tube pres are more prevalent, and the tone shaping you can do is to the point where most people would have a hard time discerning the difference.
Kind of funny that it's the much older and the younger folks who are "get off my lawn" and the middle-aged guys defending the new tech. Maybe too many years playing in front of tubes wrecked my hearing, but the difference isn't discernible enough to me to warrant the extra weight. As I said before, YMMV.