I think we need more information.
We will have 4 below average snowfall seasons in 5 years. If we get 1 above average and 1 average snowfall winter in the next 5 we will match the 90s
Now, if we only get 1 average or above average snowfall winter over next 5, then we at least have some evidence.
Also, if we go 20 years with less than 5 average to below average snowfall winters.
The problem when correlating CC to snowfall is that we have had a wretched stretch from 1970 through 1999, so it will take a LOT to definitively correlate the two.
Also who knows how CC will ultimately affect our snowfall chances. Some of those terrible 80s winters where all the snow was to our south may end up squarely hitting us. Now our 80s patter repeat could be historically snowy.
To sum up, nobody at this time can make a definitive statement that the current (only 5 year) stretch is "the new norm". It's impossible to know. We need more time.