I think they'll add a new 4th tier over DM... 200k MQMs/year? There are a fair number of flights where there are usually DM's in coach because there are more DMs than F seats, even if none of them sell. Obviously the most "loyal" customers should be given priority over lowly DMs and PMs.

JAC and NAS both allow FO to use FC check-in, but neither have any priority screening lanes. RDU used to allow FO to use FC check-in, but does not anymore.

or DL could increase the MQM requirement for each tier by 25K.

My experience as a silver at JFK, LGA, FLL, MIA, AMS, ZRH and BRU is:
- Major hubs like JFK have dedicated check in rows for silvers (the one for JFK is at T2).
- Smaller hubs and international silvers can check in at Sky Priority. I always see a sign then with who is included with Sky Priority, and then underneath on the same sign Silver medallions and Skyteam Elite are mentioned separately to indicate they can check in there too.
- I sometimes get luggage priority tags even when it is not a Silver benefit.
- At JFK and LGA no priority security for silvers. At AMS silvers do get priority security offered courtesy of KL. Otherwise sometimes we get priority security (ZRH, FLL), sometimes not (BRU). It totally depends on airport personnel.

All in all I have never been refused my published benefits. Anything on top of that is a bonus.

+1 ^

(perhaps except a lesser increase for FO... not sure the current FO perks are worth requiring 50k of travel to earn!)