I would probably buy original tables if they were releasing such, but I wouldn't be too happy about it. Looking at Zen it's pretty clear that what they put out is lightyears away from real pinball tables from real designers as far as table design and rulesets go. They've been getting better at it recently, and there are a handful of actually really well done tables on the platform (Fear Itself is probably the crown jewel), but overall it's going to be incredibly difficult for anyone to get to the level the Bally/Williams and old Gottlieb designers were at at their peak. I think it'd just lead to disappointment.
It´s not to hard it has been done 17 years ago...