As I have shown with all these iPad and Android apps they are doing the same thing as Biab would need to do.
It's not saying an ipad can do it all, you don't need a desktop, but you can perform Live with it or you can create up songs/ideas on the fly traveling on the train into London each day, then transfer the frozen songs from your m4a iPad/Android to your desktop Linux/Mac/Win with wav file RealTracks.
Look at the price of a new iPad compared to having to fork out for a new Ketron Live Arranger Keyboard $5000 or and iPad M4 $1000.
"only pg can answer if its possible conceptually for them to make their apps run on ipads." that's not rocket science that only PG can explain to us poor users, I have shown Reaper opening frozen wma/m4a/wav/flac/mp3 SGU files better than RealBand, the way is now implemented in the BBPlugin yet we are still waiting for fixes from 6 months ago. If we all had to wait for PG to do the right thing, make big leaps and initiate features available in other audio apps without a bit (lot) of pushing they would still be in the 90's. Don't just sit back and wait for the farmer to feed the chickens at xmas time and take whatever you are given. Don't sit back when the farmer says his time signatures are correct and the rest of the world is wrong.