In the last full paragraph of this post:
I wrote that following this year's Yovel would seem an ideal time to resume counting of the Yovel cycle by the Sanhedrin. The wording I wrote would seem to imply that I meant for the Halacha to immediately return to Chachamim and have 5776 be year 50 and 5777 be year number 1, but I guess it indeed would be more consistent with the analysis written to say that they should begin counting this year.
And then a few days ago I found this:
The announcement there is from eleven months ago, and yesterday I received confirmation that year number one was indeed counted on Tzom Gedaliah.