I climed to 1300 rating, and then opened up one of my old accounts, and climed from 850 ->1300 rating in under a week playing 10/0. I don't think blitz is any different. Chess is a 0 luck game with no variance so generally these games MMR stability is very high. If your MMR is different than your skill level, our MMR adjusts very quickly. Try playing a 5v5 game like Dota... 1 hour games with 9 other people in the match you have no control over... trying to go +100 wins in this game takes a lifetime.
I bet u a 2500 MMR player could climb from 900->1800 blitz in an afternoon.
(^ other pointless background redacted ^)
So... I wonder what % of the 1500+ blitz players could quickly and steadily, (or even ever) track in a very linear fashion back up the ranks to regain their high rank, if they took such a fall, as in a reasonably contiguous winning streak, or, would a surprsing number of them get caught up in the churn of their presumed chess 'inferiors' and fail to advance to what their previously assigned/perceived level was?