You're assuming that there will be a constant increase, numbers are not even back to 2019 levels. As we've seen in the past any number of factors can negatively impact tourism in any given year. Global financial factors, health crisis, conflicts. etc etc.
Also worth remembering the higher growth markets are closer to home and typically of shorter stay duration so it may not reflect a massive rise in numbers here at any one time.
The Indian and Chinese markets have increased the lower low season months without dramatically increasing the traditional high season months.