@Woob_woobit would be awesome if you're down to running it. I think it's fine waiting until new year to do it, unless someone else wants to run it at the same tame you run the Year End Megalist.
I just saw a new "Best records of the decade" thread was created, and I think it would be much cooler if we did a megalist like we do with ROTY, instead of everyone just chiming in to add their personal list and that's it.
There is a logic to the way of counting sugested by HRD (counting decades from 0 to 9 would imply there was a year 0 where the first decade AD started, which of course is not how things work), but I think it is more practical to count from 0 to 9, since it avoids situations like the one I just asked HRD (is it logical to count the year 2000 as part of the 90's?).