See, I would argue your first point, though. I not saying ppl have totally abandoned Piranha Plant, but its user drop-off was far more pronounced than that of Joker. Not only has MKLeo made some serious waves with him, but if you play in and around Elite smash you will still see a lot of them, myself included. One only lasted a week while the other is still going strong after what? Three months? PP was more of a novelty in my opinion. And to Wynn's point, just because PP represents something unique in terms of scope, that doesn't mean it's a good thing. It represents that our expectations, especially mine, have no definitive bottom. It represents that long-standing fan favorites like Geno or a plethora of so many others are considered lower priority than a generic enemy regardless of recognizability. An inclusion like PP says one of four things, period:
A) Sakurai wants Geno but can't get the rights
B) Sakurai doesn't actually give a **** about Geno despite what he says
C) Sakurai wants Geno, can get the rights, but deems him lower priority than a generic enemy WTF character
or
D) Sakurai wants Geno, can get the rights, and is saving him for a massive hype-gasm of DLC because he knows it will sell (much better than PP would have if it had been paid-for DLC)
I sincerely hope that scenario D is the case, however, it is also the most unlikely. Regardless, my point is that PP, despite any uniqueness or character, does not offer ANY positive clues as to whether Geno is going to make it in. People can still enjoy the character, but you have to understand that there are many of us that feel like PP was the exact opposite of Cloud. Rather than expanding the belief of anything being possible, PP instead reminded us all that we can just as easily get something incredibly mundane as well. Then take into account how much hype B-K has brought to the DLC. Could you imagine getting something like Goomba or paratroopa for DLC#5? If such a day ever came, I would bury Geno's chances for good. To be honest, if Geno ends up failing to get in via DLC or otherwise, I would have no choice but to assume we have either scenario A or B.
Oh, and one last thing to consider: Since the creation of PP in smash bros, the once generic enemy has been elevated to full character status in the Mario extended universe. For example, in the new switch version of Mario tennis, they made the standard PP a playable character in ADDITION to Petey Pirahna. That's right. We get to play not just one, BUT TWO varieties of plant. I can pretty much guarantee that the next mario kart will have a piranha plant as a playable driver. What I'm saying is, Smash bros has some serious power when it comes to making characters relevant. If Geno had made it in instead of PP, I might have already had the chance to knock that ball around the tennis court as Geno. He could have made an appearance in Mario V Sonic: Dawn of Justice at the Olympic games. I could be racing on the next Star Road with the blue puppet boi. It's technically not too late for him, but it shouldn't be hard to see why others might regard PP with negative bias given the implications of its inclusion. It's simply a difference of opinion.