Unless Nintendo plans to release the Switch relatively soon, there is no way they are going to choose Xavier for their chip. Personally, it seems like Nintendo will be targeting a 2024 release date unless 2022 drops off a cliff. By 2024 Xavier would be four years old, and that's just too old at that point to put into a console. 

Instead, they are likely going to use Orin which will come out this year, which would put it at two years old by the time Switch 2 comes out (same time difference from X1 to Switch). In addition, Orin can have a lower TDP (as low as 5W), greater ability for DLSS, and has headroom to be downclocked in order to preserve battery without sacrificing visual fidelity. If they use Xavier we won't be receiving graphics that hold up to Xbox One S standards due to them downclocking the GPU in order to reduce power draw. It just wouldn't be worth it. 

Yeah, I understand is not equivalent but is an easy way to compare Old Switch vs Posible New Swith Graphical power.

For a custom chip I was referring to a Modified Orin or even an Orin+ in a way that help the most for a portable console, like Oculus Quest 2's Qualcomm Snapdragon XR2 chip.

Yes, we need bigger and better Carts, maybe new Storage Expansion Cards?

What is your Launch Price for the next Switch?

The Switch 2 would have to be twice as powerful as the Steam deck. In reality, if it's released in the next two years, it'd most likely match the Steam deck. We're talking 8th gen console performance (PS4pro at best), a few years into the 9th gen (similar to what the Switch did).

Doubtful to be honest, I don't see the Switch 2 being much more powerful then the steam deck. Nintendo isn't known for choosing cutting edge technology for a long time now. Also the series S probably will not be the main focus platform for many developers. The PS5 will most likely be the focus platform for many Devs. With ports to a more powerful and less powerful system. The latter already running at 1080p in practice and not always at the same frame rate as PS5 or Series X. To port it from that to the Switch 2 will be quite the task. Also Series S and PS5 will have more in common than Switch 2 and PS5. So I don't think Series S is too relevant for the Switch 2. After all it's just powerful enough to run next gen games at 1080p or sometimes 1440p and usually with some (easy) cutbacks.

No it's not.

If the new Switch has Tensor and Ray Tracing cores... Then flops doesn't account for that.

Makes sense.

An enhanced/modified Xavier or Orin seems to be the general consensus I think.

If you want more bandwidth... Then MicroSD cards can only take you so far.
But it depends if that's the path Nintendo intends to go down though... If they are content with the current performance profile, then they may just bolster capacities of their ROM rather than speed.

It is theoretically doable right now. The problem is the cost, and Ninty's reluctance to lose money on hardware.  It is not going to be possible to deliver Series S performance in a reasonably sized handheld, with at least 2.5 hours of battery life, for $300-$350 (or even $400), at break even or better, in 2024.  

While Nintendo is getting harder to predict with each year, expect a generational power leap from the Switch 2. I don't see Nintendo doing another incramental specs leap for a new platform, not this soon.
GameCube to Wii: Refresh specs
Wii to Wii U: Generational
Wii U to Switch: Refresh specs
Switch to Switch 2: Generational (prediction)
Switch 2 in docked mode will be Xbox One-level specs at worst, between a PS4 and PS4 Pro at best.
Xbox Series S will likely still be getting a lot of third-party support in 2024 or so. I suppose it will make things potentially easier than they are for Switch right now.