Don't know if the drop is actually something to celebrate for....whatever don't care anymore.
It's already Tuesday and the mempool is still decreasing (we touched 4 sat/vByte). I'd say that the usage is closer to normal, but the +22-25% pace of mining (bigger than the max 17% I expected) handles all the daily load and then some.
I do celebrate the fact that the problem from previous difficulty period is getting cleared up nicely. Of course, this also means a drop in fees.
P2P transactions may have been dropping indeed, some decided to wait, as I also suggested in this thread. But I am sure that this difficulty period they will send all of those transactions and more, also consolidating the inputs and preparing for future bad days.
I do agree that this kind of situation should not happen and the network should be stable and at reasonable price (not for high priority, but still go through in 10-14 days), but nothing is perfect in life after all...