You can always go back!
The thing with Meccano was the sheer range of various girders, plates, wheels, axles, gears, that came with it. You could literally build just about anything at all with the stuff.
Back then that's what people did for hobbies - they built things with their hands. Meccano, Lego, Kenner, craft and bead kits, modelling clay, soapstone, etc were great for kids on up through adults. Model cars, planes, ships whether built from plastic or metal kits or from scratch using raw blocks, ticks and boards of balsa wood, room-sized model train layouts complete with landscaped mountains and towns, flyable control-line airplane models, remote control miniature power boats, etc. People built them with their own hands for fun, then they played with what they built, and then they built some more.
These days, kids' fingers tend to work joysticks and keypads. If the power were to go out tomorrow, those kids would be screwed! Come to think of it, so would many of their parents too.
The old Meccano Magazine used to be a great source of ideas for not just Meccano addicts but for any kind of modelling hobbyist. Page below is from http://meccano.magazines.free.fr/html/1967/6705/67050034.htm , and there are hundreds more spanning seven decades at http://meccano.magazines.free.fr/
You couldn't even give this to kids nowawadays. This would easily be a 12-14 and up toy. Today's little Billy might swallow a screw~!!!!
Guess what...we all swallowed SOMETHING like this at one point. And you know what? We're all alive and learned how much it hurt...and we didn't do it ever again. lol