gary....
I have had touch screens many times before with out a problem over time ....the PA800 is no different...if your concerned about the key-feel..I suggest you find one and try it out to address the issues which will make you a happy player. These are my observations only which I have to deal with on a daily basis on stage......what works for others is something THEY HAVE TO FIGURE OUT. Yes the new 76 key Korg will certainly be interesting.
http://www.musicpascher.com/boutique/korg%20pa2x-p-42.html


good luck