It looks to be on the cards after years of fudge and pussyfooting about with the weakness of the external borders. Better late than never does not work with this one, the doors have been open for years. Checking every person coming in to the EU from another territory, even those with EU passports, as is proposed, should always have been the case. Other places do it. Their nationals might have shorter queues to go through, but they still get checked.
We might also get:
The creation of a pan European Intelligence service.
And a new mini-Schengen zone withn the old zone - a stronger Schengen in the old weak one.
The first should not be too controversial, depending on its remit. We already have Europol.
The second is far more interesting. Those five countries are effectively saying that there are already too many suspects wandering about within Schengen and they want extra control within a super strong secondary border.
Not only will those countries outside the mini-Schengen not agree, but even if it was set up it would only work if the countries inside did a vigorous round-up and expulsion of those suspects already on the inside. That would need a huge political step change from current, and entrenched, thinking.