That hasn't been true for a decade, and anyone who actually pays attention to college basketball would know that.
WCC Bids by Year
07-08 - 3 (USD, GU, SMC)
08-09 - 1 (GU)
09-10 - 2 (GU, SMC)
10-11 - 1 (GU)
11-12 - 3 (BYU, GU, SMC)
12-13 - 2 (GU, SMC)
13-14 - 2 (GU, BYU)
14-15 - 2 (GU, BYU)
15-16 - 1 (GU)
16-17 - 2 (GU, SMC)
17-18 - 1 (GU)
18-19 - 2 (GU, SMC)
So it's been a 1 bid league 4 times since 2007-08, a 2 bid league 6 times, and a 3 bid league twice. Impressively, it sent three teams to the tournament as an 8 team league in 2007-08, and 3 again as a nine team league in 2011-12.
In the last 12 years, its been a multiple bid league 8 times. It's hardly usually a one bid league. It's actually a damn good basketball conference that posted a winning record against the Pac-12 this year and has a number of other programs that have a long tradition of basketball success (USF and Bill Russell, Santa Clara with Nash and Rambis, etc.)...
I don't mean to be aggressive, I just find it such an over-done talking point to dismiss Gonzaga. Out of 32 NCAA conferences, the WCC is 8th in the RPI.