I like the idea of locking tokens for increased voting power (and potentially, for staking rewards); it does indeed align people better with the long term success of ENS, since it prevents them from supporting a destructive action and immediately selling their tokens before it can affect them.
However, I question the usefulness of allowing staked tokens to be liquid; that effectively bypasses the lockup, and in the end state you could reasonably expect all tokens to be locked for the longest period, since the locked/staked tokens are just as liquid, and more valuable.