The phrase "it's only to be expected" is often used to express inevitability or predictability. There are many synonyms one can use in place of this phrase, such as "it's no surprise," "it's par for the course," "it's natural," "it's customary," or "it's usual." Other possible alternatives include "it's routine," "it's common knowledge," "it's a given," "it's a foregone conclusion," or "it's expected behavior." These phrases all convey the idea that the expected outcome or behavior is not unusual or unexpected. Using rich and effective synonyms can help to enrich your language and add variety to your communication.