I wish Line 6 would take a look at the Hughes & Kettner Grandmeister 36 tube head and blatantly copy a few things for a modeling head.
First of all, people who use modelers generally don't want to drag around a mostly empty Marshall sized head around. Make a 100-150 watt MONO head that is less than 20" wide to fit all kinds of cabinets and act like a lunch box. Remember. MONO. If you must make a stereo head, that is fine...charge an extra $100 or so more than the MONO head.
128 selectable midi programs, not a few channels. If you are using midi control, then use it. Don't limit channel selection to that of a 20th century 2-4 channel analog head.
Line 6 has a lot of great ideas, but its time to evolve from the archaic perception of the guitar amp.