Hopefully for Sony sell better in Japan than the PS4 did, especially early on as the PS4's start in Japan was pretty much a disaster, being outsold by the Dreamcast and Wii U of all things in the same timeframe (first 6 or 9 month, can't remember which one)

PS4 is on it's way out, selling way less than 10k with such a big release is a pretty sad sight, especially since the PS5 is at least one year away.

No Switch release is major mistake. Joker in Smash and screw you, Nintendo. 

Famitsu undertracked Switch hardware.

But there has to be a reason for it to do better, releasing what is essentially just more of the same will do nothing to change the decline of the PS brand in Japan.

PS4 has the full support of Japanese and western 3rd parties and it's struggling to reach 10 million, PS5 needs to offer something outside the box to recover in Japan but that's not going to happen because it could potentially affect the western sales and Sony is not going to and should not risk that.

But there has to be a reason for it to do better, releasing what is essentially just more of the same will do nothing to change the decline of the PS brand in Japan.

PS4 has the full support of Japanese and western 3rd parties and it's struggling to reach 10 million, PS5 needs to offer something outside the box to recover in Japan but that's not going to happen because it could potentially affect the western sales and Sony is not going to and should not risk that.

I can only see PS5 doing worse in Japan than PS4.  Think back to 2013.  If a Japanese person wanted a home console, then what were they going to get?  Wii U sucked (and had a small library) and Japan never buys XBox.  That just leaves PS4.  It was the only viable option.

This time around Switch is a viable option.  Most weeks, when we see the top 30 chart for Japan, there are several games that get both a PS4 and Switch version.  Switch is now a viable option.  It is reasonable to expect that after PS5 releases, a lot of Japanese games will be PS5 and Switch or possibly Switch only.  Switch has already outsold PS4's 6 year total in about 2.5 years.  Switch is definitely the main platform for Japan.  There are going to be a lot of Japanese PS4 owners that will just buy a Switch and never consider the PS5.

In Japan PS5 is definitely going to decline compared to PS4.

I'm expecting that, too, unless Sony comes with something that Japanese gamers really want. But so far, it looks just like more of the same, a Playstation 1.4, if you will. That's not enough to catch the attention of Japanese gamers.

If even 1.4. More like PlayStation 0.2.

Sony has been focusing on the west, Most of their first party games are aimed at the western audience. I don't think they care that much about the Japanese market anymore and why would they? Their huge sales in North America and Europe have got them to 102.8 million shipments in just under 6 years.