Re: time to hire up a coach?
Why don't we wait until after the Asia series and YEC before we talk about coaching change. Maria's had a good year, Rome and Cincinnati titles, Wimbledon and Miami finals, semi finals in RG and Indian Wells. She loves playing in Asia and has a chance to do really well. And Sasha will be inInstanbul to cheer her on at the YEC.
Maria isn't the only player who could have taken advantage of openess of the tour this year but she is one of the few players who did. Vika and Caroline also did and that's why those 3 have the rankings they do.
In a nutshell, I think Thomas is making gains with Maria. Let's give him a bit more time.