Doesn't Jam Origin have a bunch of patents on their process of polyphonic pitch detection though ? I think its not just a question of processing power, latency etc, but also having the overall algorithms to detect pitch, predict what is next, determine sustain et al., which is where things get tricky, been lots of crap for years that is hardly playable
Then on top of that, there is the questions of overall synthesis, and if you want to be limited to just subtractive synth sounds, or if you also want some sample playback abilities etc
Personally, I think Midi Guitar 2 is pretty sweet. I use the desktop version as I like being able to plug in different VST's. Its actually a pretty good stand alone host as well for vst's, and that of course opens up tons of awesome softsynths, sample libraries etc. I just upgraded to NI Komplete Ultimate Collectors Edition last week, so I've still got like 300 gigs of data to download, but literally like any synth or sample sound you could ever want and for $299... awesome deal.
Again, I wouldn't mind if the Axe could do a bit more, but realistically, its still not going to be a great synth, nor is it likely to have anywhere near the best realtime playing experience, so what would really be the point ? Tons of effort for Cliff on something that only a handful of players actually want, and for those folks who do want it, there are already some really good and quite affordable tools on the market that work great.
Long story short, I'll give you a +1 on the wish, but doubt it would even happen, and even if it does happen, doubt my guitar processor is going to replace any of my synths.....
Now running my synths through my Axe-Fx for effects..... that works fantastic