The Department of National Defence is actively considering whether to retire some older ships, planes and other items of equipment that have become difficult and costly to maintain — including the aircraft belonging to the iconic Snowbird demonstration squadron.
The F18 is also an antique, it made its first flight in 1978.
On a personal note I hope they stick with something relatively quiet. I got to watch weeks of the Snowbirds practicing this spring and while they are noisy, all 10 of them in the air together are quieter than 1 F18.