Disc players are difficult; they must be designed around a specific disc mechanism and the mechanisms go out of production regularly, forcing manufacturers to purchase a "lifetime supply" for any products they make.
I suspect, but do not know, they could no longer source the drive mechanism or some other key component of the C-5xeMP but have the parts to continue making the CX-7eMP, as the latter is "just" a CD player where the former was a universal player based on a universal DVD drive.
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