To be honest, I don't think it would've made a massive difference. I've just about given up on Namco doing anything for the Klonoa series. The sales of every Klonoa game have been abysmal, and even the comics never really took off, I think in Namco's eyes, Klonoa is a lost cause. To be honest, I don't think a petition signed by a handful of people would convince them otherwise.
Petitions are fine, but I think we should try and make a few fan-made content, such as a fan series (maybe even a cartoon?) or a really good fan game, and try and get them taking off. Maybe then, Namco may notice this, and eventually do something with the Klonoa series.
That's just my opinion, though.