I like this proposal because this is the current solution which can be implement. Otherwise i don't want this long powerdown period as a investor. I have already written a post on it
https://steemit.com/steem/@mehta/re-feedback-wanted-4-week-power-down
The new system is like our indian banking system, where we got higher interest/inflation rate if we put fiat money longer in bank say:
2 Years - 7.0% annually
365 days - 6.5% annually
200 days - 6.0% annually
100 days - 5.5% annually
30 days - 5.0% annually
15 days - 4.0% annually
If we withdraw earlier then committed time of locking, we got according to our locking period - small penelty (say 0.5% annually).

I am completely agree with this practical solution provided by @steemit