As for Sap, I didn't know there was a way to counter it with Tree of Life form. If there isn't then what's changed?
ToL isn't a viable way to stop rogue CC, as it's an on-use cooldown. All the rogue team has to do is wait out ToL, sap the druid, then go to town on the druid's partner.
Of course, this really only works as a rogue team where the druid's partner can't get into combat, or if the druid is too far/out of LOS of their partner.
If the druid's partner (say a warrior) gets into combat and the druid puts a hot on the warrior, the druid will get into combat as well, making it impossible for a rogue to sap.
So basically it'll work at really low levels of arena play, but not at 1800+.