How much do you think the nationalisation of aircraft making in the 1930's affected the ability to get modern replacement aircraft into service?
Can't say for sure. On the one hand, it probably helped organize production on the macro scale. On the other, it temporarily disorganized local production at the existing factories at a crucial time for rearmament. I think the major issue was that there were too many programs going on at the same time, with specs that kept falling behind the technological advances or favored mediocre multi-role performance (the infamous Air Force BCR - Bomber Fighter Recon - programs for example).
Same with tanks in a way, IMHO, which ended up with France fielding FCM-36s, H-35s (and its developments), R-35s, Somuas, B1-bis, D-2s, D-1s, 2Cs... Infantry tanks, cavalry tanks, heavy tanks, breakthrough tanks...The French army would have been better served if they had been issued similar weapons systems. Personally, I'd have gone with the D-2 and S-35 tanks, which were on par or superior to the Pz-III and got the best bang for the buck ratio (400,000 francs for a D-2, 1.5 million francs for a B-1bis).
In the end, though, the deciding factor for France's collapse was that the whole war plan was betting everything on ONE scenario - which almost came into play, to be fair - and that the high command was absolutely inept.