Looks like 2021/22 Niseko's expansion sets them up to link to and revitalize Mt. Weiss in the near future.
There is such a thing as too much snow in Niseko. On the last two days in 2011 it snowed 40 inches. The sidecountry gates were closed and I got bogged down and stuck frequently. If you are getting 4-6 inches a day as we did in 2016, it may get tracked but not packed unless it doesn't snow at all for a couple of days. The ideal new snow scenario IMHO is 10-12 inches. We had three of those in 2016. It skis really deep but is not enough to close the gates.When you get a storm in the Sea of Japan, then you can get up into the 12-20" zone.
I'll be in my late 50's. I need to get there sooner while I have the energy and skills for the top notches of this type of skiing.