This actually makes me happier than it should. I thought Porky gained popularity just over these past few weeks due to the concept of Heroes vs Villains, but I researched a bit and in a SourceGaming article I found this image about potential characters that were requested:
Although I saw this, in the exact same article they list the top 50 characters requested, and Porky doesn't seem to be in, but either Skull Kid (I didn't really fully read the article, I just went a bit over it for a quick "lazy" resarch, so correct me if I'm wrong). I believe Porky didn't get requested enough in the ballot, and as far as I know, Smash Ultimate's roster is built up from the ballot, so we may get Porky as DLC if he continues to gain such popularity. Still it seems that we're getting Skull Kid, and I'm extremely convinced of this due to various reasons that you can see everyone talk about, so maybe Porky could definitely be another great villain addition to the roster. Hopes on Porky, either for the main game or as DLC!
Btw when seeing all of this I figured out that actually Masked Man wasn't the most requested character for an Earthbound rep, I just happened to see a heck lot of comments in YouTube videos about him and that led me to believe that, Porky seemed underrated for me.