Why are there so many personal insults on both sides? They do nothing to support one's argument; conversely, they detract from it.
To return to the Thread Topic, I do not think Reverse Time / Rewind is in need of either a nerf or a change in dynamics. Against a normal rush, it's a little weaker than comparable hard CC; in exchange, it becomes stronger against buffs and counters some combos.
Eternity is another matter. When RT becomes spammable, the weakness declines and and the strengths increase. However, it pays for that - literally, with the highest non-nymph ability cost in the game. It's damage is also weak when compared to the other spammable CC weapon, Eagle's Eye. I don't think it needs to be changed.