I estimate a .5% increase in interest rates reduces the lump sum 6%. This reduction could take 6 months of working to recover if rates do not increase further. In the current rate increase staircase, today may be the peak lump sum for people with 20 years or more and it may not increase until rates stop rising, which could be years. Of course, you get your salary, which is ok, but your pension is kinda eroding. I reckon rates are headed to 4%, so at least two years of work for many people just to stay even, treading water.
Thus, the rush of retirements.