Timeline is fluid because everything moves slowly. PS5 is likely going mostly as is until 2026. Let's guess 2027 at the earliest for PS6, but if people are spooked about adoption or price, maybe even 2028 if the economy worsens. Then that means PS6 with an optional disc drive is going to be around 2027 - 2034. 2035, the "console" will still exist as a local computing device but it will look a lot different.
Sony is already porting everything to PC. If China's gaming market keeps growing over the next decade, it'll keep making up a larger portion of total sales, and it's on PC. Sony already does cloud gaming. Sony already has an app. Sony has already launched a game that replicates the PSN overlay on PC with trophies. They've pretty much almost gotten there already in 2024. That's where they will get investment, by laying out to investors how they plan to grow into new areas and get new customers.
Nintendo already has their back catalog locked to a digital only subscription. If they ever have a generation that slows down below what the Switch 1 is doing, they could very easily pivot as well.
It's incredibly easy to predict that MS is going this route because they've basically already said it publicly, with interviews talking about their aims for a Windows-Lite OS, multi-store, forward compatibility. It barely even counts as a prediction. I'm increasing the difficulty of my prediction by adding Sony. What do you think is going to happen? No PC ports? No cloud or app? Discs on PS only for the next 15 years?