Just finished the survey. Mine was business version (as opposed to leisure).

Would not be happy with any of this being implemented.

When working always had to purchase Main Cabin, but most of the time could immediately get C+.

If they take C+ at (well, after) booking for DM/PM, I have no reason to prefer DL. If they take away SkyClub access based on ticket type/fare, ditto. My home airport has a club. These are the two things that I value for flying DL.

They should have sent me the leisure one as I retired in December. Then again I've already had 3 RT leiusure trips and have about that many more planned. Although our largest $$$ for this year (so far) is a TATL on a different carrier (which just may be in SkyTeam by the time the flights happen).