Toss with timewarp/storm are gonna be crushing these low tech armies all day although that would still probably come later with both stargate and templar tech so for toss it might be difficult still requiring back line cannons still.
zerg would still be doing the same thing with defensive banelings.
Now keep in mind this is purely theorycraft and is in no way a zerg up thread. I do however feel like zerg is quickly losing any chance of harassment in this game. Muta harass seems less and less used or worth the investment, ling run bys are becoming non existent as the meta game shifts more and more macro based from all teams and they make defenses accordingly, and of course the nydus is still relatively pointless. We all know Brood infestor is losing its effectiveness at some point soon whether it be hots or sooner.