$20K for ambassador status may be steep for those of us who work for organizations with high discount/negotiated rates. I'm frequently at 120+ nights across both, and its a big reason of why I pick SPG over other brands. Hopefully they take that into consideration for us corporate travelers who still hit high value of nights but are beholden to policy as well.
If I lost my ambassador and could only get "Platinum Premier", there would be an incentive to diversify a bit after 75.