Namco is not pushing the name on Super Smash Bros., general pessimism for third party characters, a lot of people really don't like the idea of Pac-man, and there was never any interest expressed to begin with. Not to mention any cult support now means absolute jack, and it's never going to reach Sonic amounts of popularity to negate that.
1. I don't think the first point really means that much, tbh.
2. Sakurai stated that third party characters were all going to be legendary, and Pac-Man fits that role. I can't think of anyone who would be a better fit for the next third-party if it's not Pac-Man.
3. Sure some people don't like it. But I've honestly only seen people hating on him on this forum.
4. I honestly think that most people are welcome to his inclusion at the very least. And Pac-Man is the most well-known gaming icon of all time. He's well-liked.
5. Honestly, I don't see him being a Sonic case. I see him as being negotiated for very early in development.
This is all very subjective, though.
And I'm sorry I snapped at you. Shouldn't be insulting you now just because you upset me.