Yes, you were saying people who are stopping at 15s now for the max reward will stop at 20s in DF for the max reward.
A 20 is well beyond most of those peoples skill level, both now in SL and especially in DF.
I've brought people who are doing 15s into 20 keys and they've single-handedly managed to almost make us not time it with how bad they've played. It would in a lot of cases have been easier if they just sat AFK at the start.