The biggest concern is going to be internet availability and data caps. I tried the beta for Project Stream (now Stadia) this past winter. It worked well and was impressive, but I have a good internet connection with a 1TB cap. I have friends with much worse speeds and harsher caps and I am not sure if this would be viable for them.
I am more concerned about 'physical' gaming being phased out. I doubt Stadia will do this soon, but I like building a new computer every 4 years for playing games. Maybes it's something I won't actually miss(like how I don't miss CDs for music), but it remains to be seen.