Jim, in my opinion if sold today they would probably be purchased only by us old retreads. I don't think the current generation would have the patience to construct anything with an Erector set. Too much time and effort. I watch my Grandchildren and they are virtually obsessed with computer games like Mine-craft and Roblox where things can be made and or destroyed in a manner of minutes-instant gratification.
American Bricks were a great item and my wife and I still construct buildings with them for our Christmas layout each year. We have had them for decades and enjoy them but the finished products are very fragile and easily toppled. Today's snap together toys like Legos are much sturdier when put together. Again, I think the patience of this generation would wear thin very quickly with American Bricks so I doubt they would sell very well. The other two products you mentioned, Skyline building kits and Block City, I really can't comment on since I'm not familiar with them. Anyway, if someone would produce new Erector sets and new American Bricks I would buy them but then again I'm and old retread.
