Maybe because nowadays you can make an hybrid with the same or better torque/horsepower and a lot higher fuel efficiency than the turbo. That is pretty much where the entire industry is shifting, and also where the demand is. Regular engine variants are sitting on dealer lots while there is a long wait list for hybrid variant of the same car. The CX-70/90 has an hybrid with similar power and torque than the high output inline 6 variant.
Hopefully they keep the turbo around, but from a market perspective I could see them replacing it with a high output hybrid
Looks like the turbo is officially being replaced by the hybrid variant, but it is apparently only coming in 2027.

This Is Why Mazda Won't Bring Back The CX-5 Turbo
A new model will replace it as the "power option."
