The problem with pinball isn't pinball...it's the fact that it's a coin-operated game and coin-operated games are generally irrelevant to our culture.
Pinball right now is embraced by those with nostalgia and a 20/30-something "hipster" generation that likes the old school nature of it. Based on that - changing it too radically risks turning people away. Some innovation is cool, but I don't think it will ever be a massive gamechanger as pinball is just a small part of one scene - the arcade. If the arcade is dead, then the coolest pinball ever won't make a blip on the mass culture.
IMO collectors, barcades, and tournaments are what will keep pinball alive for whatever time it has left.