Remove complexity and execution barriers from game
Game journo complaint: game getting too complicated
*mash mash mash*
To be fair the video does probably echo the sentiment that a lot of casuals feel with fighting games in general. It's scrubtalk 101, but that's also the market all these FG devs want to cater to. Every FG seems to have this dilemma where they want to appeal to both casuals and tryhards, but don't know how to keep the casuals playing after they're inevitably curbstomped online.
I don't even necessarily mind lowering execution barriers a bit, as someone who couldn't nail a 1-frame link to save my life. But that by itself isn't going to get casuals playing.
IMO it's just about giving people more stuff to do outside of online ranked matches. Throw in a decent story mode or single-player campaign like MK9 or Soul Calibur. Make some easy to follow tutorials, but understand that most casuals probably aren't going to jump into training mode to begin with, so shoehorn some of them into your SP campaign or even just add some intro movies that
demonstrate important game mechanics before they've even hit start. Explain and demonstrate things like frame traps, cross-ups, etc somewhere in-game and make it digestible for your Average Joe.
Even just including better online features would probably go a long way. Soul Calibur 5 still had the best online system that I've seen with it's
Global Colosseo which was essentially a giant lobby system where you could host your own rooms, spectate other people's rooms,
cybor chat, make your own fight cards, etc. If some noob was really hung up on playing other beginners, they could simply host a 'BEGINNERS ONLY' room and kick anyone who was 'too good' if they wanted to. SC5 also had the benefit of its elaborate character creation system, so even shit players would have a good time sharing their rendition of Naruto in their own personal weeaboo lobby.
If you want casual players, just give them good single player and online components and you'll get them. Dumbing down mechanics probably won't work because button mashers won't know the difference... just find better ways of showing them how to actually play the game.