Well, the latest version is almost a month old, it's still alpha and some minor bugs appear, like disappearing cooldown numbers and spell blacklisting via rightclick is not possible anymore. Also there should be support for future spells/items. I like sexycooldown and doesn't really want to switch to fx, thats why I am asking myself if it will be continued :)
"The last update was almost a month ago" is pretty much the polar opposite of "this addon might be abandoned"...
Also, how should support for "future spells/items" be implemented? If the spells or items don't exist yet, do you think the addon author(s) is/are psychic and can read Blizzard's mind in the future and know what spells or items they're going to add? Neither SexyCooldown nor any other cooldown addon depends on a hardcoded list of "this spell's cooldown is X seconds long", or even a list of spells it should watch. It figures that out by using the WoW API, the set of functions implemented by Blizzard specifically to allow addons to retreive information from, and send commands to, the game client.
The only cooldowns that are hardcoded are the internal cooldowns of items, such as trinkets, and those are provided by the embedded third-party library LibInternalCooldowns-1.0, not by SexyCooldown itself.
Finally, this forum is for official threads about released addons, not for random questions. Those go in the HELP! forum, which is where I'm moving your thread.
Another thing (which would be more important) I discovered today is that it does tank my fps to 4fps when I enter combat, and I've narrowed it down to SexyCooldown as it doesn't do it with it disabled.