The future ? Powered cabs with built in lightweight digital power section + i pad
I gotta buy an ipad to run my bass rig? A separate, relatively fragile multi-hundred dollar gizmo that takes up nearly as much space (once protectively cased) as a micro?
Powered cabs, fine. (Especially if the "power" part is easily bypassed, and field swappable/upgradeable with nothing more than 2 minutes and maybe a screwdriver.)
Even if my pre is digital, at least make it a dedicated/hardened unit that can be operated without an i-gizmo attached. Stick a USB port on it to talk to any gizmos on hand, that'd be fine. Probably should make it at least large/heavy enough to not get lost in pants/coat pockets, and handle having a bass plugged into it without falling down at the slightest tug.
But then... hey, there's room in the case to put a power module now. That's an even more convenient place than in the cab. Voila... a micro.
Now, for micros vs combos...
Who says the point of a micro is solely for tiny portable rigs? They'd work just fine for my large 3-way cab. Or an 8x10, 4x15, or whatever. Maybe one plays where decent backline cabs are usually available, but would rather use their own head. Maybe one has cabs at home and at the drummer's place, and like the idea of just bringing a tiny head back and forth. Maybe one also has a little cab for portability, and since the head fits in the gigbag it is functionally *no different* than if they were carrying a combo. Maybe one is using IEM's, and doesn't need a cab a the gig, but likes to play through a cab at home or rehearsal. And why drag a combo in order to have your favorite DI with you at a recording session, if you're going to be wearing cans there anyway? If one carries it as a backup for their main rig (as so many do), why would they want to waste haul space (and money) to have it buried in a little cab as a combo?
Maybe many of the above scenarios may apply for the same player, at various times? A micro looks pretty darn convenient for all of them. Clearly superior to the combo for all except one, and nearly as good as the combo for that one.
If Peavey made a micro, I'd be looking at it. I won't even look at a combo, I have zero use for it, and there's no way it'd ever compete with the 12/6 or F112 I'm considering for my "small rig" anyway.
I've played a number of their heads over the years, with the Megabass being a favorite. I did look at their current lineup before buying my current head. I have it racked with a Peavey IPR 3000, in case I need to really bring some serious heat.
But I'm still attracted to micros... for convenient portability AND flexibility. I always like to try different preamps. A micro is like a preamp that happens to have power on board already. I could use one with my big rig (either alone, or as a preamp) just as well as with a small one. Can't do that with a combo.