The "Glory days" are long gone, but what needs to be remembered is the fact that pinball machines were produced for one reason - to make money for operators. They were measured on their earning capacity. What we have today, is an expensive hobby. That's what we measure pinball on today. I've never heard anyone say "I collected this title because it made a fortune in it's route days". I'm sure only a handful of people can remember those days.
As an industry, it is on its "last legs". Especially in Australia. As a hobby, growth has been on the incline. Interest in owning machines has never been this vibrant. Five years ago, I was totally amazed at how many people WANTED to own machines, but had no idea how to buy a machine. The demand back then was huge, supply was poor and the quality of games being prepared for home use was deplorable. It was alarming to hear the stories. Thankfully, that has changed (for the most part) and supply far outweighs demand. Now hobbyists are a LOT more savvy (thanks to internet resources) and can source, recondition and maintain their own games.
Parts producers will continue the production of parts. Rubbers, balls and globes will always be plentiful. Boards will continually be produced, and in some cases improved. Ramps and plastics sets are still being produced, and companies like Planetary Pinball have committed to producing parts they have patents to.
Big question is - "for how long".
Consider this - You can still buy parts for 50's woodrails including plastic sets and backglasses. I have no doubt that our kids will be able to restore and maintain machines as long as we teach them. Hobbyists and Parts producers are the key to the future of Pinball. Technology may work against the future of pinball, as kids are distracted by gadgets etc. But pinballs were here before the X Box, Wii and Playstation, and the pinnies will STILL be around well after the gadgets and consoles are landfill.