Still lots of questions to be answered, but these things usually go from smoke to fire very quickly.
If GOP leaders with strong IC ties quickly begin to distance themselves from the President, than that would mean they've been tipped as to what is coming. But, I have not seen that yet.
The story could be that Flynn was a bit of a lone wolf, and was fired not for lying, but freewheeling without permission. I think there is more going on, but because story losing momentum, cannot rule out that no death blow story exists.
But, still cannot rule out that we are in a hold pattern, as the FISA dump is still being processed.
My guess is we will know in approx. 30 days whether the Russia - Trump/Trump campaign story has any legs.