No point in imagining such scenarios. Jackson will be the only recusal, in Harvard, which has already been clear for months. Affirmative action in college admissions will certainly finally be overturned, very likely in 6-2 and 6-3 votes.
The remaining question, I think, is how far it will sweep—whether this ends up just being a decision about college admissions, or whether it will extend to race-based hiring and contracting as well.
The court order made it clear
"Should this Court overrule Grutter v. Bollinger, 539 U.S. 306 (2003), and hold
that institutions of higher education cannot use race as a factor in admissions?"
the scope is limited to higher education only. Other levels of education will likely be addressed in the Virginia high school case. Hiring would need other cases as well, which likely would arrive soon.
I'm aware of the mechanics. But there are a lot of ways to write an opinion overruling
Grutter, some of which would discourage challenges to other systems of racial preferences. If the Court says, for example, "the use of racial preferences is statistically no longer be necessary to further the interest at stake in
Grutter," that would dampen litigation applying the case to other situations, because it would allow judges a way to distinguish the ruling ("your district is less integrated than the avg university, so racial preferences are still okay here"). By contrast, if the Court says "affirmative action in university admissions is unconstitutional because the Equal Protection Clause prohibits all forms of racial preferences everywhere all the time, please file cases overturning those" it would have sweeping effects very quickly.