If everyone involved with Sublime disappeared tomorrow, Sublime would still work -- and likely continue to be usable for at least a few years.
I don't understand what the concern is here.
As you say, developers marry their editors. I certainly would be frustrated if Sublime were abandoned tomorrow, but I'd still rather use it today over any other editor.
Like we aren't used to this too. Textmate and many other good editors were left eating dust and no one died. If Sublime Text dies I'm sure another will take its place.
I don't understand what the concern is here.
As you say, developers marry their editors. I certainly would be frustrated if Sublime were abandoned tomorrow, but I'd still rather use it today over any other editor.