Based on what? And as much as I enjoyed the first Kick-Ass, and tolerate Kick-Ass 2 as an acceptable (if disappointing) follow-up, both of which had a lot of Internet hype before release. And Internet hype also would lead one to believe that Scott Pilgrim vs. the World, Snakes on a Plane, Hulk '03 and an R-rated Aliens vs. Predator movie would be hits...it doesn't quite pan out that way.
This is an example of "fan" culture and mainstream culture not agreeing, and as fan culture rules the Internet...inversely it is why World War Z can be a hit despite years of Internet whining and trashing, Michael Bay still gets to make movies and The Dark Knight Rises was well received, despite what comic readers think.
With that said, I still am delusional enough to mildly hope for a third. It will only happen if Matthew Vaughn is determined to see it exist, and there is a significant budget cut. Neither of which I see happening. But hey, I will be happily surprised if it impossibly does happen.