We had originally intended to EOL version Snort 18.104.22.168 as well. However, there are external third-party vendors that are on 22.214.171.124, and because of their development cycle, can't upgrade just yet, so it's going to hang around while our third-party ecosystem is given a chance to upgrade.
We are also planning on releasing bug fix 126.96.36.199 (tentatively) on Dec. 19, followed by a larger release of 188.8.131.52 in April 2020 (tentatively).
We have been watching the number of downloads of these versions, on a week-to-week basis since September, and while the raw numbers of downloaders have been decreasing (and the drastic uptick in downloaders in 184.108.40.206 and 220.127.116.11) there are still about 42,000 users on those two versions, so we urge everyone on those two versions to upgrade as soon as possible.
Thanks everyone! Happy upgrading.