I wasn’t aware of that series, so I searched it, looks like it may have ended.
Gonzaga vs. Washington State: Zags and Cougs close chapter on rivalry for time being
I didn’t do any more digging to see if there is something happening in the future. It looks like the same old story as most other long-standing series that come to an end. One side just does not get any benefit from it. Oddly, it’s the “little guy” telling the “big guy” to go pound sand. But let’s face it, Gonzaga isn’t exactly a little guy.