I hate to say it, but it might be time to nerf ZZ'Rot Portal.
It's an interesting item, for sure. But now, I'm seeing top laners begin to rush it before anything else. It limits your ability to help out other lanes. Hell, you can't even push down the enemy tower because the portal keeps your CS from reaching it.
The only real way to counter it is to buy one yourself, or be Nasus. Could we maybe reduce the spawn rate of them? I'd rather have the duration increased and the spawn rate decreased than have to sit through this Portal VS Portal game for the rest of the season.