Cakewalk's 'membership' model has been favourably viewed when compared with Adobe's 'subscription' model.
Maybe it would be a real PR feather in the cap for Cakewalk if they adopted Adobe's free monthly demo system. Thinking about it, Adobe arguably has less competition that Cakewalk, so them offering a free, fully featured (i.e. no restrictions whatsoever, including saving) demo as they do might seem counterintuitive, in as much as you'd think that there being more competition out there in the DAW market, it would be those companies that would offer the more enticing demo version.
I honestly believe that charging for a demo version, even selling it as a month's membership (so it would be fully featured), seems a little bit mean.