If you never play with others that can hold aggro to prevent your VS detoggle, it's useless.
If you never play with others that can grant status protection to prevent your VS detoggle, it's useless.
If you never take powers that grant your character status protection to prevent your VS detoggle, it's useless.
If you only fight enemies that can hit you with a status effect that detoggles VS, it's useless.
...you see my point? It's a player's choice. I prefer the toggle, especially since the original had such a long cooldown and a very large up front end cost.