Actually right now we're below January 2017 levels, far before the spam attack
Let's just ...not!
Bitmain could just unplug their miners for a few hours and the whole capacity gained by segwit will be destroyed by higher blocks time. I just hope that they still have two brain cells active and don't try to put such plan into action.
This is actually one of the main reasons for the drop in transactions and it was clear when Coinbase went offline for a few hours.