You are certainly looking at the correct factors.. If your landlord starts such a proceeding, you should run not walk to an experienced tenants' attorney. If you are simply thinking about protecting yourself, you should break out the costs. Example: tell your roommate in writing that s/he is paying $614 toward the rent, $___ toward the cable, $___ toward phone service, $____ toward electricity, and $___ toward food.
Dear New York Tenant:
The facts you described would support a landlord decision to terminate your tenancy. When posting on AVVO do not state your specific facts. Asking as a hypothetical is not the same as a statement of facts which the landlord may "discover" and use against you as an admission against interest.
See a lawyer specializing in tenant's rights.
The answer provided to you is in the nature of general information. The general proposition being that you should try to avoid a bad outcome if you can.