Do keep in mind psi-ops apparently work a bit different from the other classes... Apparently they don't level up like normal, but you need to send 'em back to an extended visit to the psi labs, at the end of which you can pick from one of 3 random powers. I think even the initial power is randomized... In any case, leveling a psi-ops takes time and a lot of resources, but you can eventually give one soldier every power, which is nice.
And then your Psi-Ops dies horribly on a mission, which is terrible.
If you're the Imperium of Man, sure.
That wink wasn't so much a "kill all the psykers!" so much as "That's XCOM, baby!"
...Y'know, 'cause %#!& happens in XCOM.