I have compared WT+ and CW fares out to the end of the year and the pattern is quite similiar. The changes seemed to have occurred in my opinion with BA flying A350 to Vancouver versus 777 and 380. I used to be able to buy WT+ quite easily by adding on $300 USD for YVR LHR TLV routes return. Travelling in style now in economy. Quite amusing to me when I exercise my priority boarding with status and I wonder down an empty plane to the very rear.