Obviously people seem to know who my wants are, so this post may come off as a little bit biased. However, I'm not trying to take digs at anybody here.
Remember yesterday when we got that SourceGaming poll, and the massive amount of 3rd parties in the Top 50-100 compared to First parties? I feel like that was slightly shrugged off. Obviously, a poll such as that doesn't tell us who is in the game. Popularity is only one aspect of how characters are chosen. There are very few characters who got in purely because of popularity. However, poll results like that don't exist in a vacuum. The wants exist before and after the poll...they build up over time.
When I see things like Dante in the position of #5, I think back to many of the times this thread thought he was a meme pick, as if Devil May Cry isn't a popular series that shook up the genre. As if Dante's personality isn't what makes him a likable, iconic character. There were actually people who were "surprised" at him placing so high.
2B, another character people have shrugged off, placed at #17. Considering she's a character who has never appeared on a Nintendo console prior, that's a pretty substantial placing. Yet, to some here she's a nobody.
Here's my point- The Smash fanbase has this perspective that, overall, "long awaited" Smash picks like Isaac or Bandanna Waddle Dee would be these massive picks for fans of any background. That's fine as a personal preference, as I myself would really love to see Isaac. The thing of it is though, a good portion of "Major" fan-made first party picks are either side characters in their respective series or a lead character from a series that hasn't had a new title in some time. Waluigi is Waluigi though, you're not going to find many characters more iconic or known than a Mario character. That said, I don't know that simply existing as a Mario character means more people want you as a pick than anyone else.
Some of these first party picks might make waves in the direct Smash community, but beyond that? Certain 3rd parties would most likely overshadow them. This doesn't mean 1st parties are objectively bad, just that the overall interest has shifted.
I think folks are taking people preference that they want more "new" series and characters to cross over and bring "new" content as this insult to first parties, when that's a pretty typical mentality nowadays. It's only natural that after we've had a massive roster that hits most of the "major" series and characters, and the crossover spreads to series that folks wouldn't have expected, or dreamed decades about (Person, Dragon Quest and Banjo, for some examples) people have new dreams and aspirations of what that roster could look like. There's really nothing wrong with that.