Publishing an expected results date in advance doesn't really resolve anything. Folks will complain anyway.
Look at Oregon as an example, they publish June 20th as the results date when the regs come out every January. But go over to iFish and their draw results thread is up over 88,000 views now (which is alot for them). Since the advent of posting results online, ODFW has never waited until the 20th to actually release results, always released earlier. Seeing how much flak ODFW is taking now on facebook and other media (even though they're technically releasing "on time"), setting a results release date in advance doesn't necessarily reduce the complaints....
I doubt WDFW decides to move to a set date for results in the future.