Huh? This is just ONE position at CBC (one which CBC is curiously turning into 4). CBC has not stopped hiring white males, so far as I know. So, your analogy of a medical school hypothetically "shutting the doors" to (all) white males is not the least bit analogous to CBC's new hirings at this ONE show. How do you know some white males weren't on a short list for The National hirings but didn't make the final cut? You don't. Based on no evidence whatsoever, you just choose to assume white males were not considered for the job.

To note in passing, CBC Radio 1 show "Q" once hosted by Jian Ghomeshi (of Iranian extraction) is now known as "q" & hosted Tom Power, a European extraction Newfoundlander. So, it seems CBC is NOT against replacing popular show hosts (including visible minority ones like Ghomeshi) with white males born and raised in Canada. 

&if you don't like how CBC's run,blame CBC's governing Board(long -&still- controlled by hand picked Harper appointees)for hiring bad execs