SCOTUS is not going to strike down the VRA in its entirety.
They wouldn't have to. They would just need to rule that Section 2 and Section 5 do not apply to redistricting. It's a little out there, but certainly within the realm of possibilities.
I can imagine striking section 5, particularly since Congress came close to that during the last decade. I don't see section 2 going away since there is too much weight of precedence defining the parameters of its application to redistricting. I expect that tightening the applicability will happen during this decade depending on which states have their cases go to SCOTUS.