The question of using applications that are dependent on Mono has been a vexatious one for a long time. Nobody in the FOSS community has ever raised an objection to the provision of the packages by any GNU/Linux distribution; it's only the question of making these applications a part of the default set that has resulted in endless arguments.
The Debian project has shown no inclination to discuss the issue on its mailing lists either, though most contentious issues are thrashed out there. This is a strange departure from the norm and leaves the door fully open for conjecture.
It would be good to see a statement, couched in plain language, from the project about its Mono stance.