PS5 will... PS6 won't... console prices are not going down like they used to, generations will come to an end, PS5 with an SSD and a modern processor from AMD won't stop getting new releases for A LONG TIME, more time than PS4 with its Jaguar that was outdated since the release back in 2013, PS6 will be just a more powerful console, with its own innovations when it comes to controllers and features but won't be a necessary jump, PS6 will wrap the gen with 80M max and will probably be released at $600 and won't have price cuts.
You actually believe that Sony will lose 40m from it's console install base? No freaking way is that going to happen because 95% of that 40m are not going streaming only and/or spending thousands on a high end PC and that's with PlayStation 6 potentially releasing at $600.
Too many people here look at Xbox and believe that they lost 35m console owners between Xbox 360 (approximately 85m) and Xbox One (approximately 50m) due to putting games on PC when if anything, that kept them alive because you can look at PlayStation 2 (approximately 160m) to PlayStation 3 (approximately 90m) and then factor in Xbox (approximately 25m). Sony lost approximately 70m users while Xbox gained approximately 60m users. And neither were doing anything PC related at the time. This also excludes Wii which had 100m+ user install base yet Wii U was under 15m.
Consumers/gamers left Xbox because Microsoft fucked up horribly in 2013. DRM, digital only, $500, stuck with Kinect and under-powered. While Sony didn't have DRM, supported discs, removed the PS Eye Camera which was going to be packed in with the PS4 but unlike Microsoft was a peripheral as opposed to Kinect being tied to the Xbox One console for some odd reason, released at $400 and was more powerful.
Like the current generation, Microsoft was basically up Sony's ass during PS4/XBO for about two years and fell off a cliff but not because of PC whatsoever but because they kept fucking up over and over along with not having any studios, no roadmap and obviously no games from 2017 onward. Microsoft was up Sony's ass this generation for about 18 months. Once Starfield/Redfall were delayed and they had nothing for 2022 along with the never ending saga of the ABK acquisition, consumers simply said fuck this shit.
Even if Microsoft had never put their games on PC (or PlayStation/Nintendo for that matter) but everything else remained the same, they would still be in the same exact position as they currently are and were last generation. PC gaming are for those who want the ultimate premium shit where they literally have the best of everything as well as MODS, emulation, free online multi-player and their games basically last forever as opposed to console which doesn't have free multi-player, emulation, have to hope the next console is backwards compatible and while Xbox has MODS, it's nowhere near the level or extent that PC offers.
PC is also an open platform where you don't need anyone to license/approve your game for retail on Steam, Epic, etc. plus there's so many different options that a walled garden called a console will never offer. However, it comes at a very steep price and cost that unless you're already a PC gamer, few are going to leave console gaming and if one of the three fuck up, you still have the other two to fall back on.
Everyone wants to believe that because Microsoft releases their games on PC and their console hardware is dying that the same will happen to Sony but the major difference is that Sony hasn't had a shit ton of fuck ups in the last decade like Microsoft has. Again, even if you subtract Microsoft releasing their games on PC/PlayStation/Nintendo, they would still be exactly where they are right now because they've made so many other major mistakes that releasing their games on PC/PlayStation/Nintendo in all honesty is the least of their fuck ups.
Most of all, Sony is quiet (only Nintendo is quieter) and rarely talks where as Microsoft never shuts the fuck up which in turn does far more harm to their Xbox brand than good because their messaging is literally inconsistent and always changing. That's why consumers get fed up with a product/brand/company because they pivot every time you turn around and it's like, fuck that company where as Sony pretty much stays the same. Their direction is the same - granted, expanding but still the same shit at it's core.