A: No. The landlord isn't able to end a tenancy for capricious reasons. He can only end a month-to-month tenancy for cause under section 47 of the Act, for employment under section 48, or for conversion or his own use under section 49.
So the landlord is kinda' hooped in the situation you describe - unless he cuts a deal with the month-to-month guy and gets it in writing that the tenancy is ending by consent of the parties.
Leases are different because they have specific start and end dates, which is why many landlords prefer them; but thinking about tossing out a month-to-month tenant so the landlord can rent it to somebody else could quickly get the landlord into considerable trouble, unanticipated expenses, and a substantial expenditure of time and resources - not to mention that he will also experience a remarkable amount of anxiety and stress if his actions get challenged.