I think it's definitely a case of the lower tiers becoming more inflated with little to no affect at DM. Yes, there are a few people that will hit DM from rollover, but just as many will do what others in this thread have stated - stop flying DL once achieving DM to get status somewhere else. It's really going to affect SM and GM as they don't fly enough to hit status in any one year. If someone carries over 25k MQM to hit DM, they still flew 100k that year - vastly different from the 10k carryover to hit SM for an infrequent traveller. If anything this really just means the Zone 2 boarding line will be that much longer with more elite members at the lower tiers.