the next battlefield ...
will be in advances which aid or assist users who eyesight and/or coordination is failing.
Otherwise there will be an almighty crash that will ring around the world as the wrinklies (you know - the ones who have the money) are forced to give up their iShinys and retire from the digital scene.
Don't be surprised if there is a "revival" of desktops in 10 years time. As grandfolk everywhere dust off their old keyboards and big screens to continue surfing and buying.
You read it here first.