Not so sure of all that. I'd rather say that the western powers were hoping that the Germans would bog-down in Poland, and were stunned by the swift victory. There wasn't much they could have done about it anyway, except engaging in an offensive into Germany, - something never planned at all. And the horrors of WWI were still alive in everybody's mind.
Actually, the British were DISARMING almost to the outbreak of WW2, and Churchill, predicting the agressions and evilness of the Nazis (as well as claiming it being worse than communism) was frequently named a "warmonger" or somthing of that sort.
As for the German Navy, it "could" have made a little threat if it would have kept hidden until the capital ships were ready. One TG is yet little compared to what the RN was sporting. And before 1942 there were far bigger events at work...
And where did GB self-destruct???? Not getting you M8....
1.-Yes, the quick collapse of Polland was surprising. But France was not where near as industrialised as Germany in 1939. Keep in Mind that Germany was the most advanced, industrialised mobilised country in Europe. France needed time to "modernised" their factories in order to produce at the same level as the Germans... and the Germans factories weren't even at full capacity yet. When they occupied Chzecoslovakia, Germany gained great industrial capacities. Occupying Poland would have increase it even more. That's why France needed time to bring their investment into their own factories and American factories into fruition.
France needed time to mobilise the full human resources of its empire... Germany was already mobilised. And when it comes to technology, well, under-investment placed the French army at a disadvantace.
2.-The Kriegsmarine was engaged in a program of ship-building. It was fortcasted that by 1942 it could match the Royal Navy. But, because the war started in 1939, all they could hope was to conduct bucaneer operations. Remember, at the time, you can defeate the British only if you could stop the Royal Navy from controlling the sea, even if you never set foot in Britain.
3.-Both France and GB ended up bankrupt after WWII. So heavily in debt to the US and unable to mantain their empires that they went from World leaders, to tennant of empires that ended up tearing themsleves to pieces which could not impose its will over its own territory. As for Germany, well, it went from the most advance country in Europe to a country occupied for over 50 years by 4 foreign countries.... least we say about the rubble in the Germans cities (1945), the better off we are.