I have a matrix comparing old vs new. If you are not staying 5 night at level 2,3 or 4 you lose point value. A 7 night stay at South Beach is now 95,000 points more.
You should reward members with points saved under old plan. Remove blackout dates one month before you change the the point structure at the very least. Better yet, just keep your point structure and get rid of the blackout dates. I have left Hilton honors and Priority club as a result of changes to their plans and will consider a similar move!