I mean, anything less than ps4 is a bad sign.
Xbox is none existant and a complete none starter in Japan.
If ps5 is considerably down from ps4 in the end..it's joever for Sony in Japan, unless they release a switch style console perhaps and even then nintendo will jist dominate with their exclusives.
Context is key.
The PS4 launched at 40k yen, the PS4 slim launched at 30k yen.
The PS5 disc launched at 50k yen, the Digital PS5 launched at 40k.
3 years and a half later, the Disc PS5 is 67k yen and the Digital PS5 is 60k yen.
A quick search on google will tell you that wages haven't increased too much in Japan in the last 10-15 years.
BUYING power is the main problem for the PS5 when the entry level switch is portable and it only cost 22k yen.
If it does better than the PS4 it will be a HUGE win at that price, although, software is lower than the ps4.