I still see them in the lobby. Which
pokerstars site do you play on? On the main international site they are currently reducing the selection of SnGs with the purpose of reducing waiting time, but they have not touched any of the KO SnGs. That could be different though, if you play on one of the smaller regional sites, where perhaps these have not run frequently.
In general I think, its fine with a bit less different variants of SnGs. It simplifies game selection and makes the lobby easier to navigate. On the international site some of the games, that are gone, are regular speed fifty/50 (still have turbos), 12 man SnGs (kind of a weird format anyway), and some heads up PLO and other special variants.