I've already accepted that he's not getting in, even with the hopes and thinking about why he should get in, the representation and how much you can do with it etc.
Doomguy feels like he's in some unique position because he has both a lot for him and a lot against him.
There was some odd balance for him that may not really change, if he gets in or not.
But it feels like most of the barriers being broken were coincidences, luck or rare exceptions, some with explenations for them.
I can also see how Bethesda could mess with his inclusion.
Like, Doom 3 stuff being specifically the BFG edition, no Doom 64, some historical revisionism (Both accidental and intentional), some forced Doot joke somewhere, no Bobby Prince songs etc.
Doom fanservice nowadays is honestly hit or miss, and you know something's wrong when whoever made the trailer for the crap ports couldn't tell a difference between Doom 1 and 2
https://twitter.com/SlappyCromwell/status/1154891498510589953 while most fans could recognize most levels.
Fans also came up with a lot of good stuff and wouldn't screw a Switch port like this.
They even had their E3 conference staring a dude claiming credit for the creation of first person shooters.
I think in some away, i prefer Doomguy not getting in, than getting in but with some monkey's paw type of problems.
Regardless, Doom will always be a special series, whether or not it's even in Smash and there will always be franchises and characters that deserve a spot more than Doomguy.
Ryu Hayabusa and anything from SNK are honestly good inclusions with lots of potential and unlike Dovahkiin or another FPS rep, they don't feel like they're stealing Doomguy's potential, because they offer special and more specific legacies on their own.
I think a problem with Smash is that, for a series that celebrates gaming history, some people treat it as a replacement for actually learning or investing into video game history.
Which is why some people feel alienated with characters they personally never cared about getting in, but some also want the additions of characters that might as well be more obscure in comparison (Because they believe automatically being a Smash fighter makes your character important and not their history outside Smash).
The same can be said about how some characters are represented in terms of design, moveset and other details, because they're never always that accurate to their source material.