I just wonder how many is "we".
The idea of having 31/1.8 + 50/1.2 + 85/1.4 (1.8 would be finee by me) and 135/1.8 and personaly I'd add 24mmm too, all FF capable, WRed and AF (SDM or screw) would VERY tempting but: look at how many people moan about the price of FAltds, I got lucky with my 31 & 43 but no such luck (yet) on 77
and hobbyst like me can't afford to spend 750GBP on new lens just like that... now add WR and SDM, keep metal build and f stop speed coupled with FF capability and the 77 would eesily go up 850-900 IMO and 31 around 1.2k....50/1.2??? around 1k too... so it's nice to dream but for the moment we have top quality glass that costs a bit, first they need to finish thee line up, then put out some cheapish lenses to keep new comers/hobbysts/amateurs interested and just then they should start thinking about upgrading the top of the line lensees... although knowing Pentax, they will do something fairly unxpected....