Personally, I don't want new lens ... the missing aperture ring annoys me; and most of the new Pentax lenses are coming without one.
I prefer to use old lenses rather than new stuff.
Now if they add the ring ... I'm all for new stuff.
But, to get things started, I have the lenses that works for me ... just need the body
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As to improving steadily ... this takes time ... is normal ... so why not introduce an FF body already and keep on improving on it?
Market will eventually move that way and small sensors will probably, slowly, disappear inside point and shoot cameras (or maybe altogether).
Why not get on it as early as possible so you can improve as fast as possible and have a place on the market rather than wait until nobody buys smaller sensors and all want FF?