They don’t have the means to produce at scale, which has resulted in wild price fluctuations on their end. (even though to steamdeck OLED did sell out at the much higher price.) To me at most they will continue with the controller, but that’s about it.
Extremely doubtful, the Steamdeck seems to be a passion project for Gaben, it is somethibg he believes in.
The question of hardware components is more of an issue of planning.
What Valve needs to do, and probably already have done, is to set up future contracts with manufacturers so they can get the components at a lower price.