Terrible idea.

The point is to increase Steem liquidity on exchanges, give investors incentives to come in and to increase Steem mobility.
With this you do none of that.

If an investor wants to earn from the ecosystem they need to lock up for the max period which vast majority will not do.
Locking up for shorter time means a loss and is pointless.
What will end up happening is that investors will simply stay away.

We need more market participation by those that believe in Steem that would, in your case just power up for max time.
This literally adds nothing positive or changes behavior which we want to happen.
Probably the single worst idea ive heard regarding this change, sry.