I do not think Yx is that bad. I stopped flying VA nearly 22 months back and was initially ok with dropping back to SG, as I had accrued just over 800 SC's through pooling and DL fights I realised I only needed 8 VA marketed sectors to retain WP. In the past three weeks I have flown the 8 sectors in booked on the middle price fare class and was in the Yx seats. This is just my observation, 3C or A for 5 fights, legroom seemed to be better than pre Yx but after 22 months I'd can not be sure, on all these fights all of R3 was occupied. Other 3 flights x2 4C and x1 4D on these flights I had a shadow.
Based on my experience I may fly VA in R4 in the short term until QF rollover date. I read on Ausbt that a WP was sent back to R12 to make way for a Yx fee paying PAX, if this happens I will be back to QF quicker than a rat up a drain pipe and VA fights will be no more.