I'm not sure about the future, but I want something that will be more future proof than the A2.
Im not sure about the kind of amp I want, Ive never used a SS amp, and my little dot Mk3 isnt really good enough of an amp to be a deciding factor, when it comes to deciding between SS and tubes.
I do know, tho, that tubes are more annoying to me.
I'm not sure as to what sound I want. I want it to be fun to listen to, doesnt matter if its colored or not.
If the difference is HUGE between the sound signature of SS vs. Tubes, im favor of the tubes, then I assume I'de like a tube amp.
You need to get out and listen where you can do a careful comparison. Once you've done so, you may find that you prefer the sound of SS, or not. But at least you'll know which way is best for you and not waste time and money mucking about. Your Little Dot MK3 doesn't have much power at 32 Ohms, the Asgard 2 can supply 3 times the power at 32 Ohms and slightly more at 300 Ohms. But first thing is to really find out, by personal listening as to which type of amp you prefer.