From my recollection, this is how the rule is stated in the FIFA handbook.

It's all about body position (not just a foot past), but I can see the frustration. Offsides is always a judgment call that deal with millimeters. If the side ref is not perpendicular with the players than just a few millimeters ahead or behind the action can make players appear to be on or offsides.

I think it will just take some time for players to adjust and then I think we'll see the way they play normalize and less and less of the calls being made.