Alright I've read over your post.
The basis of my argument is this: You can not build a house on rotten foundations
I agree with you that switching the entire community would be of course a massive undertaking. You are right in that the community was founded around DayZ*. But DayZ standalone is a dying game. To bring new players into the community and keep it alive requires new people buying the game. In the games current state (Including the massive joke that is the "1.0" release) I don't see a massive number of players coming into the community. regardless of how great modding can be, you can not build something on DayZ standalone as great as you could on say Arma 3 or GTA because the game has a plethora of issues, of course some of these issues can be fixed by modding but at it core DayZ is broken or at least in bad shape. Eventually people get bored, people get banned or people get fed up with the game. We NEED new people and new ideas to keep things fresh and I do not believe Standalone will give us that.
Of course, I could be wrong. And @Cipher if I am wrong and DayZ Standalone somehow rebounds to say the player numbers it saw in mod, I will gladly write " @Cipher was right" on my four head, put on a bugs bunny outfit and drink an entire bottle of hot sauce while Space Jam plays in the background.