Frank, you have to ask yourself, what would be the benefit?
People looking for a dedicated Canadian domain community find you anyway.
People that aren't interested in the .CA market aren't going to participate.
All people still need to meet CIRA requirements, whether DN.ca runs on its own two feet or as a part of NamePros.
Yet you'd be giving away control over a community you worked hard to build.
Without knowing what your goals/objectives are, I am leaning in favour of you running DN.ca as it is today.