Even if this were to be a clone of Quantum Accelerator; I think we're forgetting the absolute size and scale of the hillside that has been present; and how that directly contradicts where exactly Quantum Accelerator is being placed at (which if I recall; is mostly flat space).
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Even with Quantum Accelerator's footprint being on-par; let's not forget the terrain differences that comes down to the two locations. Alongside that--it'd boil down to a similar element that I could've sworn prevented SFMM initially when they considered the Dive Coaster. As SeaWorld San Diego and Knotts would already have dive coasters dominating the so-cal region as it stood.
Even with the only straddle coaster in California being in San Diego; I still think people need to consider if that'd be a reasonable call for SFMM to make. Alongside that, if this was meant to be a "big" addition that'd require the terraforming/grading of the hillside; then they'd use it for an attraction that'd stand out with this large of a footprint.
It didn't seem like a family coaster from the rumors I was informed--and that I can absolutely be wrong; but I don't think they'd shift gears as quick as they would think of