I think an advisor or consultant is the best idea.
Petra won't fire Kotyza in the recent future anyway and I think that he's not bad coach. Her problems for past two years were mainly physical or mental, yes, he could help her more but he also couldn't tell her what to do and especially who to date.
He only wasn't able to get her to the very top and beat the best players more often.
That would a job for Martina, because it's mainly about mental preparation and tactics.
Remember, I haven't read, been blocking out all those Petra articles, personal stuff that you guys been telling us about.
Well, now that we're talking about this stuff, and Wimbys over; I can say this:
I was watching a roundtable on Tennis Channel with Coach Paul Annacone, Jim Courier, Martina Nav, and Mary Carillo the other day.
Basically, what Paul, Jim and Martina said (remember, Mary wasn't that good, so kept her mouth shut mostly),
different coaches work well with different people; so you change them. And you need different coaches for different stages of your career. Some coaches can't take certain players to the next level, and that's why you need change. Other coaches may see better tactics, or can help you improve in another area better. This is why you always see so much change, experimenting with players
All of them talked about their personal experiences, agreeing as coach or player. Now, we all knew this stuff, and discussed it ourselves. However, it was good to hear it reiterated by these greats.
Saying all that. I would never advocate firing Kotyza outright. I know Petra loves him, has an emotional connection with him. However, it would be great if she brought in an outside consultant, advisor or mentor (officially or unofficially) to help her overcome her lesser strengths (day in day out professionalism; believing you should win every title all the time, etc). Plus, as you said, someone who can help Kotyza with tactics. I don't always feel he's the best one for that (in Aussie Open 2012, he used 2011 Wimby tactics on Pova). And I still can't forgive him for saying Serena was the "best player in the world" at the beginning of the 2012 season. I know what Kotyza was doing. He was trying to take the pressure off of a nervous Kvitova. But I think subconsciously, it also made Petra feel she had an excuse to lose to Serena, or truly didn't believe she could beat her, even when the matches were competitive or there for the taking, such as Dubai (or Doha, whatever).
But for now: Let's see what this 2nd Wimby crown does for Petra's maturity, confidence, happiness and professionalism?? As you said. Maybe this mostly had to do with her. We'll see, soon enough?