Governments ought to change at regular intervals, just to keep things honest. After ten years, an administration tends to run out of ideas and energy. A time out of power is a time to recharge the batteries.
Trudeau may be unqualified, inexperineced, and not very bright, but he has some experienced and qualified people around him. With luck, he will be wise enough to listen to their counsel.
In the meantime, look at the bigger picture. In the Anglosphere as a whole, here is who is in power. right of centre in blue, left-of centre in red.