Mine still works perfectly but I have heard that other have gone bad. I expect mine to break within 5 years. 
If this becomes industry standard I would expect the technology to greatly improve though.  

 Sure. My Fold hinge broke, so I will likely move back to a normal phone.

I'm planning on a Pixel + GrapheneOS. 

 I want to have that combo eventually. RN I have the OnePlus running lineageOS 21, once they stop supporting the 7pro I will most likely move to that.