I expect they would need to keep a stock of the older controllers and other parts to cover warranty claims. The electronics and motor have a two year warranty in any case.Slightly off topic, so apologises to Rose.
But, if I had an older type wisper and I read the above quote, I would be praying my controller never dies
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Electronic parts tend to fail early or not at all. If the controller lasts a year, it will probably last for ten years. Of course you could be seriously unlucky, but that applies to anything you buy....
If you bought a TV set three years ago and it failed now, you might have quite a problem sourcing parts. Back then it would probably have had a CRT - now they're all plasma or LCD.
I think it's called 'progress'!
My main concerns with an e-bike, looking back at the story so far, would be: Are the manufacturers likely to be still there in two years time, or maybe less, to honour your warranty claim, and could you still obtain a suitable replacement battery (at any price!) when THAT unhappy day arrives?
Rog.