You can easily predict support for fancy electronics by checkng out things that are mass produced, like TV sets. We found that when the TV craps out, it is cheaper to buy a new one.
The aviation industry is a slightly larger market than model trains. We all have these neat little hand-held GPS units. When one breaks (and they do break) we ship it to the factory, and they pretend to fix it, sending us a brand new unit for the repair charge.
My favorite GPS is the 295. When they go dead there is no hope. You drop it in the electronics recycling and get a newer model. Parts are not available.
Likewise radios. The very best radio out there is a portable Icom, and they do not make them anymore. They will not fix them either.
The model train market is so much smaller than any of these - when your electronics break, it is time to upgrade.