All? IMO, there's little to no chance of that. I personally would go back to amps and analog pedals if all modelers and the like relied on iOS or Android devices.
It's tempting to think that any given choice will become universal (you see this in the discussions about NAM). That's an understandably appealing prospect for people who like a particular design choice. But it's much more likely that a diversity hardware and software design choices and feature sets will exist, catering to different preferences.
I'll tolerate a touch screen that I don't have to use much (which is more than I thought I could say a year or so ago). I'm on board with computer-based deep-dive sound editors for pedals or modelers. But count me as being on team knobs.
I'm likely in the "Hybrid" approach club myself.
My 2016 Honda Accord went way overboard with LCD touchscreens and almost no knobs at all (not even for volume!). I decidedly did not like that (and they added more knobs in later models).
My X32 Rack mixer has a GUI and knobs/buttons to control it, but it is pretty clunky to do so. The PC editor and tablet/phone interfaces are very mature and it works quite well.
For a digital amp, it just seems like the complexity justifies more control than can afford to be put on small devices. The Kemper Player is a great example IMO. There are just so many things that need to be controlled that the interface doesn't fit on the device.
The FM3 and the HX stomp are good examples as well.
The Kemper's Ui/Ux is already considered "clunky" even with all its knobs. It was clunky in 2013 when I bought it!
So, for me, this comes down to 4 different use cases:
1) Gig setup, song tones, and real time modification control setup (done with a full editor on a PC)
2) Gig control (done with either a foot controller or MIDI or a combination of these two
3) Just messing around at home (done with a full editor on a PC)
4) Jam session (??)
So it's the last one where things get harry. Bending over and making adjustments to a small pedal with menu diving is tough. On our old tube amps, we would have been limited (mostly) to a little eq (my VHT UL had a 6 band master eq and a 3 band eq on each channel (clean and drive channels) along with a bunch of push buttons and of course .... gain for the drive channel.
A simple UI could be easily made today to do this wirelessly with a CME WiDi device and a phone. The channel switching could be done by a set manager for each song, and a midi pedal could do real time changes (like boost, patch change) in the middle of the song.
Honestly, gigging with my tube amp rigs was limited. I could only have 2 main sounds, then everything else was on the pedal board. There was certainly nothing simple about most pedal boards either.
My point is, that maybe we old dogs will have to learn some new tricks for the future. It is a BETTER future in my book. Smaller, less expensive, and MUCH more comprehensive tone control with capabilities I couldn't even imagine 20 years ago.
So, I now need a tablet/phone for control and monitoring at a show. I do that anyway and see lots of other bands that do the same. Maybe this is the equivalent of cell phones vs home wall mounted phones of the past?