I'd happily place a bet today on there being a family of Steam Deck devices forming a material part of the PC games industry in 5 years or earlier. Much of the implementation such as the store experience is already leagues ahead of the garbage Nintendo get away with on the Switch.
When they inevitably release a second one with an OLED display and more performance and battery life, its going to be massively compelling. Sure we can all point to failures like the Steam Boxes, but from those failures came Proton which has been directly responsible for the Deck concept working so successfully.