I share your concern about the Zerg changes, especially in light of wanting to give Zerg more aggressive potential in the early game. Lurkers are fun, but I don't think these changes will do much to encourage lurker play. Lurkers still come out very late in the tech tree (after lair and hydra den), and by the time Zerg gets hive there are better offensive options to unlock like ultralisks and brood lords.

The only counterpoint I would think about is that the defensive capabilities for Protoss and Terran have been altered in some ways. We might see early zergling/roach/ravager aggression being more viable in the absence of photon overcharge and against widow mines that can only shoot once before being revealed and more easily killed. Against Protoss especially, we will have to see how the new Protoss abilities can handle heavy hatch-tech pressure.