It would be the first time that Sony, Microsoft and Nintendo are all releasing consoles in different years. Microsoft should release their next console before Sony.

Gen 6: PS2 (2000), Xbox (2001), GameCube (2001)
Gen 7: PS3 (2006), Xbox 360 (2005), Wii (2006)
Gen 8: PS4 (2013), Xbox One (2013), Wii U (2012)
Gen 9: PS5 (2020), Xbox Series (2020), Switch (2017)

My prediction:
Gen 10: PS6 (2027), Xbox (2026), Nintendo (2025)

The release of PS5 Pro in 2024 should it make impossible for Sony to launch their next console before 2027 (I guess their plan is even 2028). Xbox Series doesn't look like that it has the momentum to sell a good amount of units until 2027 (and the new models launching this year shouldn't have such a huge effect like "Kinect"), so 2026 should be more realistic. Nintendo's next console is almost safe to be released next year.

Even if PS6 will be launched in 2028, Microsoft's next console should launch at least a year ahead. So even in this case all 3 consoles will be released in different years. Sony should release the PS6 after Microsoft and Nintendo, so they should have the advantage to react to the competitors. Thoughts?

No preference, just hope they keep supporting Steam.

Yup, I think the big players will release their new systems in completely different years.
The generational leaps have become murkier and not as sharp as previous years. And we also seem to go towards slightly longer generations

I agree with the prediction of the given years in the OP.

My Dreamcast is greatly offended at being left off the gen-six list lol

Idk. I'm not even sure they wanna compete on hardware anymore and I wouldn't be surprised if they came out with the Playstation Xbox or the Xbox Playstation. It'll all be consolidated soon after the success of PS games going to Steam and Xbox games going to PS. We'll soon see some playstation titles on Xbox, I'm sure of it.

I expect the next Xbox to come out early like the Dreamcast and have the same fate.

In all fairness, even with diminishing market viability for Xbox consoles from the 360 days, Microsoft Gaming/Microsoft as a whole has effectively limitless coffers. 

Microsoft as a whole makes insane revenue and profits, in addition to their war chests. Microsoft Gaming is highly profitable as well, thanks to the blurring of lines on PC and Xbox consoles. 

Xbox could get down to 10-20 million units sold of a console during its lifetime and still be able to fund another console because it's Microsoft.

Nintendo could've had several Wii U failures in a row, though that would terrify Nintendo. They're even more fiscally conservative with gaming historically compared to their competitors and they really want high profits for hardware and software. 

Sega's console division went the way of the dodo because of massive financial losses and bankruptcy looming that would've damaged or outright shuttered Sega. Sega did not have the money to keep supporting the Dreamcast, let alone make a new console to launch in 2004-2005. 

And responding to the thread title, I would say yes.

Switch 2 has a 99% chance of coming out in 2025. The rumors, leaks, some words from Nintendo, and some of the output of Switch seems to indicate so. Now Switch is getting far better support right now than I would've expected, but that doesn't mean it's not going to be replaced next year. Even Nintendo's AAA games tend to be AA in the industry. I would argue 2024 has had no AAA Nintendo games. Do you really consider TTYD Remake, Zelda: Echoes of Wisdom and Super Mario Party Jamboree AAA Nintendo games? I don't. There's no 3D Zelda, Xenoblade Chronicles, 3D Mario, etc. 

Xbox 5 is probably coming out in 2026 but could come out in 2027. PS6 could come out in 2027 or 2028. I'm more split on PS6's odds whereas Xbox really seems to be leaning towards 2026. They want to beat Sony to the punch by a year or two. 

TLDR: Switch 2: 2025, Xbox 5: 2026 PS6: 2027-2028

Xbox would have to eat an impossible cost getting new gen hardware out that early. They can, they are MS but why do it when profit is years off and in small figures..

I'm not sure if this is true anymore. Microsoft does indeed have all the money to burn, but in about 5 years XBox/Microsoft Gaming have spent near a trillion dollars in videogame stuff (both the massive buyouts of Zenimax and ABK, smaller studios and buying stakes on other videogame-related things). If Microsoft sees that mantaining the XBox hardware side of things is holding them back from the monumental profits they need to pay the bill, they could probably write it off, or turn it around as "pre-made gaming PCs with windows and many XBox features".

If the Xbox console does not get exclusives big enough to justify its purchase, they will continue to lose marketshare, both Sony and MS are porting to PC already, but MS is also porting to PlayStation, so it's even worse for them. And at this point, Microsoft is pretty much the biggest 3rd party publisher in the west, if not the world (not counting mobile stuff), so it's not like they couldn't negotiate good conditions with the platform holders, while having the GamePass option for revenue from PC gamers and those XBox PCs I mentioned earlier.

Tl.DR. If Microsoft sees XBox console hardware dragging down profits, they will chop it off without remorse, they've spent too much to not do so.

After some thought. Nintendo 2025. NeXt box 2027. Ps6 2028. Yeah, I think they'll both stretch this one out but PS more so, they have no need to beat Xbox to the mark and all the need to get a cheaper package together while still being a generational leap. Xbox would have to eat too much cost in 2026 for too underpowered a leap based on the pro pricing. Both will still eat cost and get good cheap packages out with a good leap and all.