The simple answer is
Yes.
Whilst NERC / Swanwick continues to rely on NAS, or the link to it, at West Drayton this will happen again and again and again.
Lose NAS (or the link) and NERC goes MANUAL. Getting NERC back to electronic operation is really not possible until the traffic levels are reduced to minimal levels either by waiting until 0200, or slapping on draconian flow measures.
So, until NAS is replaced, the link made more stable, or NERC made to run without NAS, I'm very much sadened to say that yes, this kind of failure will happen again.
The solution? Look WEST, and see what the FAA is doing about replacing NAS in it's facilities.
rgds BEX