This seems to be a problem for consumers all across the board with expensive smart trainers. If they break out of warranty, you are often screwed. None of these companies offer full spare parts. You might be able to get a new belt or something. Ironically, you can buy full spares for a 5 or 10 year old NordicTrak treadmill.
Wahoo may do better with their bike but they don’t mention it on their website. They only talk about a 1 year warranty. I’m not sure you can count on being able to repair it 3, 5 or 10 years from now. Can you even count on Wahoo to repair it in year 2???