UK games market 80% download.
https://www.eurogamer.net/articles/2019-01-03-uk-video-game-sales-now-80-percent-digital
However, that's revenue including DLC for disk games. Sales of FIFA were 25% download, so discs still very much favoured. OTOH you see widespread adoption of download - consumers are engaged with it - but OTOH you still see major titles, the ones presumed of value to the laggards, being disk-centric.
Meanwhile, the comments on this story and Game Pass show people really value it.
https://www.eurogamer.net/articles/2019-01-02-life-is-strange-2-coming-to-xbox-game-pass-this-month
I think a download only SKU with a month's Game Pass will be pretty compelling. It'll reach the penny-pinchers ad offer them superb value in Game Pass, and very likely lock them into an ongoing subscription and ecosystem. That'll only increase in value with cross-platform (PC and mobile-streaming) access. I think it's a very strong play by MS. May not reach the super budgeted 2nd hand disc users, but they probably aren't worth much as customers anyway.