And why would they be good only until 2025 according to your country?
Our present F-18 have been around since 1982 so why a much shorter lifespan for the Super Hornet?
If Canada were to order the Super Hornet this year from Boeing, perhaps a couple of years would pass before our first delivery let us say 2015 and with a 25 to 30 year lifespan that would make them operational until 2040 or 2045.
Again Canada does not need nor can afford the latest and greatest toys. If Canada decides to spend that kind of money ($40B) on new aircrafts which I think in the present economic context around the world is insane then at least we could have a fleet of 140 F-18s which technically could cover a lot more airspace.