No , its not gonna change the way ppl play , we are talking about xp whore , not about obj .
Ppl staying at respawn the whole map giving med/ammo pack doesnt help in anything, the same for cvops. they just trick the system to gain more rating.
Anyway thats not something new , at first , Anti whore thing is the main reason of TB .. since it's a big part is about rating.

I dont see in what obj part is concerned.
We are talking about abusive xp whore , its not because you heal your teammates or give ammo time to time that your are a xp whore , thats part of teamwork like you said.

Anyway rules should be well explained , and only XP whore will be penalized , nothing to worry about