I'm an Ardent Linux user and open source fan, but if cakewalk doesn't want to make it's software open source, they shouldn't (after all, they own the software.)
Issue is: why not compile a Linux version? it's not as hard as doing a mac version, and it's not a must for it to be open source.
Tracktion is doing it with its waveform DAW. The music industry would benefit much more from Bandlab releasing a linux version of cakewalk .