What is the general opinion amongst her fans about changing coach? Are they for or against such a radical move? I can kind of see both sides in that under Kotyza she reached all her success, but has the relationship gone stale, for some reason he can't get the best out of her for quite some time now and things even seem to be getting worse.
Well, I don't speak for all Petra fans, but here's my two cents.
Many of her fans wanted a coaching change last year. I'm sure those people feel stronger now. It appears now that some who wanted her coach to remain last year, more of them may want him gone at the moment. So I do think it's a majority. Now, some of her Czech faithful, may still want her to keep her current Czech manager, coach and team? But they may be a minority at the moment.
At the very least, Petra needs to away from her Manager and/or bring on a respected independent advisor, like a Pavel Slozil or Martina Navratilova (who's reached out to Petra often and currently) to get her house in order.
As you said, the current team and hierarchy are not reaching her, while being sub par to begin with (in my opinion). It's Petra's body, mind, instinct, tennis game and team that are all awry at the moment. She needs to want it to!
Petra is currently the tennis equivalent of a Walking Zombie.