You say Nintendo is just a scapegoat, but honestly, if they didn't get involved with the competitive scene in the first place, this wouldn't be happening. Just because Nintendo hasn't done anything involving PM doesn't mean Nintendo's involvement in the competitive scene isn't the primary reason this happening. Also, Sakurai just been listening more to the casual side (certainly can't blame him for that), he's pretty much given us the middle finger with tripping in Brawl Smash 4 was supposed to be a different matter altogether, but instead, we've seen Nintendo go out of their way to remove advanced techniques from Smash 4, and if Nintendo ever decides to make another balance patch, they'll likely remove more.
Just because someone says they hate the game on principle doesn't mean they are trying to kill it, and it certainly doesn't mean they are doing it out of spite. The vocal outbursts of Smash 4 hate are for a lot of different reasons, but they ARE for a reason.
As for the game's growth, just because the game grew after Nintendo pretending to care about the competitive aspect doesn't mean Nintendo had a huge impact. How much of the growth is from Nintendo? How much is from the documentary? How much is from the well over 100,000 viewers that watched the game at EVO when Nintendo actively tried to shut the game down? They've certainly grown the community, but it's not major enough that we wouldn't have generally reached those numbers within a few months anyway.
"The removal of that mod didn't kill Street Fighter's popularity. And neither will the removal of your mod."
This isn't about Smash's popularity as a series. Very few people believe in this #OneUnit nonsense. We aren't one community - Smash 4 made sure of that. Most of us only play one or two games, and legitimately don't care about the popularity of Smash as a whole. It's unfortunate, but given the kind of things that have been happening, I personally can't blame anyone for not caring about other games. Lastly, we have no desire to kick new players out, but we do have reason to want Nintendo to step away from the scene. We've seen them actively try to kill Melee, and it's hard to interpret what they're doing right now as anything but trying to force Smash 4 down our throats. Smash 4 was not what the competitive scene wanted, and Nintendo even went as far as removing ATs from the game. It almost seems like Nintendo thinks we're a bunch of idiots who won't realize they're just trying to make a quick, and I'm fairly certain that's exactly the case. I'm honestly embarrassed people are still clinging on to the belief that Nintendo wants to do good for the community. This is not a long-term investment from them. They want a quick buck from Smash 4, and then they'll be gone.