Uhh, I don't follow...reamping has, if anything, less limits, because it doesn't use any CPU power - true, you need to actually have access to all the amps you wanna reamp through, but for anyone with a decent budget that shouldn't be too difficult, and amp sims still exemplify "jacks of all trades, masters of none" IMO. Amp sims make life easier, but I don't ever see them becoming the standard.
i just mean when you say have 6 guitar tracks or whatnot, with some fancy over dub kind of stuff, unless you have say 6 5150's, or 6 Engl savages (or SE's if you want to be expensive) your not going to be able to tweak each tracks tone, you would have to mix down each guitar and run the next, which defeats the whole reason to reamp.
if you ran effects or say rigs, you would have to have that many cabinets, mics, processors. It would get expensive fast. then you also have to think of the volume issue. if you reamp you still have to crank out from the amp and cab. so unless you had a commercial recording studio, that kind for volume isn't possible unless you want to be friends with cops.
Still with plu-ins you have an unlimited number of amps (given by your CPU) that you can use, where in RL, you need to physically have that amp, that cab a mic, a mic pre and any other fx needed.
but lets not get into the whole CPU thing, i am running a 2.0 GHz dual core with 2 GB of ram and can easily run 6 or 7 instances of revalver as well as impulses, on top of all the other audio tracks, usually up to 40 with all my orchestra and still be good at 80%.
still it will be another 10 or 15 years before sims can even compete with the real thing. Realistically its a lot easier, cheaper, space efficient and tweakable to use amp sims. if you want to complain on say the CPU issue, if you pay 100+ on a CPU, unless you use a resource hungry DAW, you won;t have much of an issue until your running 8+ instances of an amp sim.