Not at all. Sure, some setups will be more popular, but all will be used. Just from experience.
Personally, my first pick is Rogers, followed by Fusman and I love Jensen. I think I serve rather well, so holding serve with him is a breeze.
We need to get it some times. I still think that Cannon can be THE best player out there in right hands.
Basically, too early to tell.
...but as I mentioned, the intent is to keep the roster balanced and usable, so will adjust if there is a need.
Just a reminder, you will have to pick a SIM player when entering a tournament and it will be shown in the draw, so we will be able to see exactly how many of each player is used. Why am I saying it? ...because each player has another in the roster that can beat him rather easy (considering similar skill of the opponent). This was the goal of the SIM Roster. So for example if in one tournament, you see a lot of Sobchack and him winning the title, I can grantee you, the next tournament will be full of Thompsons and Rogers. Eventually it will balance out.