No one knows for sure, some experts have recommended to the government that they make changes in the system, but with early elections expected in Fall, I doubt the government will change this rule this early, since it is generally very popular with most Canadians.
I reckon the earliest they will remove this policy will be either Fall (after those elections),or at the very least once at least 75% of Canadians have received their 2 doses of the COVID-19 vaccine, which probably won't happen until mid-August.
It's early to book your hotel stay right now, you can wait until past June 21st which is when the government should announce the extension of those measures.