Hey, if nothing else, spare parts would be easy to get, and the build quality on Lego is probably better than most pinball parts. That stuff is manufactured to some pretty incredible specs.
Toy story could be an awesome theme for a pin though-family friendly enough to be in public locations, but still interesting enough to not piss off adults. Better than Shrek anyway...actually, now that I think about it, Shrek would convert into Toy Story really well. The mini pinball would be right at home.