Every game they shown is going to also be released on the regular XB1. So yeah. If you're going to buy a Xbox series X at launch, it's either because you're an guy that always gets an a console at launch, or you never bought an Xbox yet, and you were waiting for the new one to get released.
I think I'll pick one up in a year or two, barring rumors that there's a mid cycle refresh like they did with the Xbox 1X.