The last generation console would have been supported for at least a couple of years, according to what was stated by Phil Spencer, and some of the new first party productions would have found a place on older hardware anyway. During the event though it was quite evident that Microsoft is fully projected towards the next-gen and only a handful of the games shown will actually arrive on Xbox One.
Nothing to worry about though, since Microsoft has confirmed that One owners will be able to enjoy the upcoming exclusives by taking advantage of the possibilities offered by cloud gaming, as indicated in a post published on Xbox Wire:
“Some of the games coming next year from our first party studios and partners, such as Starfield, Redfall and Stalker 2, require the speed, performance and technology of the Xbox Series X | S. We are thrilled to see developers realize their vision in ways that are only allowed by next-generation hardware. For the millions of users who still play on Xbox One today, we're about to share more information on how we will bring many of these next-gen games, such as Microsoft Flight Simulator, to your console via Xbox Cloud Gaming, as we do on mobile , tablet and browser ".
Undoubtedly positive news for One owners who, according to these words, they will see the life cycle of their console greatly lengthened thanks to the services of Microsoft.
The Redmond house also has confirmed found in the final stages of updating the xCloud structure, which will pass on hardware Xbox Series X. This will obviously lead to an improvement in the quality of the service, with better performance and frame rates for the games in the catalog.