Strange times indeed. What if the US and the rest of the global powers decide to shut everything down. What is a major bank or banks fail. Is it possible for limit down day 1, maybe day 2, maybe day 3? What if exchanges shut down? When they reopen you think it will be an orderly limit down but plenty of time to liquidate on a bounce?
Let's work with what we know. The day I posted (3/16/2020) already was a record day. There has never been an overnight gap larger than that in TradeStation's data: 9.78 percent in the Dow Jones. This does include all exchange shutdowns as well. To find #2 on that list, we have to go back to 2/16/1932 when it was 8.60 percent overnight gap.
So to answer your question: Yes, I think just observing the CME margins will be fine going forward. I don't believe what's ahead will be multiple times worse for the stock market than anything that actually happened in the last 100 years.
But "$34,665.25" is a *very* curious number. (Isn't anybody besides me wanting to know how that 25¢ got in there?!?)