Was this just a loss — or a reality check?

Victor Matfield and Sir John Kirwan dissect a Six Nations weekend that sent shockwaves through the tournament:

Scotland overpower England.
France look unstoppable.
Ireland bounce back.
Super Rugby begins.
JK admits he misses South Africa from Super Rugby.

Are England regressing?
Is France already in a different tier?
And what does this mean heading toward the business end of the tournament?