Thanks! ... Problem is not the 500 points up to Kvitova, but the 7 players in between!! Unlikely that all 7 + Kvitova will flunk the rest of the season.
They also have the advantage that they can play internationals (except Kvitova), which comes in hand at the end of the season and they can just start playing every tournament under the sun to try and qualify for Istanbul.
At the end of the day it seems obvious that for Caro to make Istanbul, something big has to happen. She either needs to be winning premiers and/or making SF+ at US Open.
New Haven entry list isn't out yet, only Caro, Errani, Kvitova and Kerber are confirmed as the top 10 players.
Of the rest:
PALERMO (INT) - Errani, Vinci
BASTAD (INT) - Williams
STANFORD (PRE) - Sharapova, Radwanska, Bartoli, Flipkens, Lisicki
WASHINGTON (INT) - Stephens
CARLSBAD (PRE) - Azarenka, Radwanska, Kvitova, Vinci, Bartoli, Jankovic, Flipkens
TORONTO (P5) - Everyone bar Azarenka and Bartoli
CINCINNATI (P5) - Everyone
That is every event up until New Haven. I imagine we will see some wildcards given out to some of these players in Stanford and Carlsbad too.