A friend of mine restores and sells high end 80-90 year old arcade games.
I doubt he sells to people who played these games when they were kids considering those people are more than likely dead.
There is a point when these things will be worth nothing, then there will be a point in time when pinball's will be sort after again because they will become Antiques.
works that way with cars and pretty much anything.
In saying that, I would think the market for new pinballs will dry up when this trendy bubble bursts.