I too wasnt born when the sandcast was available. I think the first motorcycle I fell in love with was my mothers honda cub!
I remember the first time I saw a CB750 K0 was when I was looking for a CB400f on ebay here in Australia. Once I saw it, I was hooked on the blue green beauty, and the chrome. By that stage I had already started restoring and earned a few bucks restoring old coffee machines. My first bike resto was a Honda GB500 - now an in demand bike here in Australia and in the USA. Back then, cosmetic parts for that bike were still available, although expensive. And now, parts have become unobtanium for it too. I realised back then what we all know now - the bikes to restore are the bikes at the top of their game for a given period.
Im speaking like it was a century ago but in reality its been a decade
Point being there will always be someone passionate about restoring and will hopefully persevere with it enough to build up to a Sandcast project. I know the experience tradesmen who are familiar with the 'old school' techniques are retiring and becoming few and far between now. So Im hoping those being trained now will be passionate enough to learn their trades well. The joy of receiving a well finished part adds to the pleasure of tightening the final nut on a completed bike.
Yamiya has also made it easier to breathe life into these projects now too. I remember when I was starting out it was ebay sniping, or lucky dip at the swap meet which determined whether you completed a bike or not. Yamiya should be commended as no doubt many of our bikes wear parts supplied by them. Forums like this one and SOHC 4 are also available now with enough information available for even a newb to complete a project.
I just want to close with the thoughts that knowledge is not commeasurate with age, and knowledge is not ability. Those with passion dont let inexperience stand in their way.
PS Its always safe to have a 'succession plan' for your assets. It is too often that assets are sold off after a death by those who know nothing about their true value. If you have a friend you can trust, you can leave their contact details in a work diary in case something happens, so they can advise what next.