I cant imagine Mazda will carry this 2.5 for 4-5 years with minor 1 mpg gains each year. The diesel is very situational - will fit very few profiles so I am already not convinced it will sell a ton.
CX-5 is begging for a new drivetrain, and no diesel does not qualify much.
Of course Mazda won't keep the engine going for much longer. They have this in the pipeline:
Mazda's next-gen SkyActiv engines will drop spark plugs in favor of high compression