Thanks for the review.
As noted by Mosè, this change does not affect latex-mode at all. Its effect on context-mode is also minimal. It basically allows the user to pick and choose, while it removes a few tools from the default for context-mode.
ConTeXt has two dialects now: Mark II and Mark IV. BibTeX is perhaps still used in Mark II, though I don't know how many people actively use Mark II ConTeXt. In Mark IV, I would say BibTeX is not required.
Now I could be more aggressive and remove BibTeX from context-mode in the default. What do you think?
I will follow the instructions for assigning the copyright to FSF.