I doubt the response of the French in particular would have been any different. With the German Army more tied up in Poland, and higher losses in men and equipment and supplies, a French (and British) attack in the west would have been even more of a success than it could have been OTL. The reality is the French were NEVER going to do that, Their plan was basically to let the Germans bleed themselves on the Maginot Line until the Germans had had enough and quit. Maybe they'd attack once the Germans were considered to have bled out enough, but not until then. The BEF forces in France in the fall of 1939 did not amount to a lot and Britain could not have staged any sort of attack if the French were not all in.
Maybe the British and French don't see the Germans as ten feet tall, and maybe they get some lessons learned if the Poles figure out ways to beat up on the Germans better. The Poles are screwed, because eventually the Germans will break through and then Stalin jumps in - you know he won't act until Poland is obviously going under.
No, the French plan never was that.
The Maginot Line was a manpower saving tool designed to use formations that couldn't have been used elsewhere to tie up German forces and allow France to concentrate its forces on the real battlefield - the West Belgian plains. Considering the French population was only a bit more than half the Germans and was older too, this was a shrewd investment, especially since the Ardennes and Vosges make terrible terrain for tanks.
The strategic interest of having Belgium was just too good for Germany - you start off a short front and you can end up anywhere on a long front. Therefore it was obvious to Ally planners Belgium would be attacked if the Germans came to war.
The big mistake of French planners was considering the Ardennes unpenetrable to mechanised war. The sector of the Maginot Line the Germans attacked was low security, had less casemates and artillery sites. To be fair, they expected Eben Emael to last longer.
However, had things gone according to plan, France and Britain would've defeated Germany quite handily. Indeed, the German armor was quite inferior to the French, but it benefited from the greater maniability given by well-implemented individual radios in every tank that made them great for breakthrough.
However, the B1-bis were the bane of German armor. It took artillery strikes or stukas to get rid of them, and the German anti-tank weapons were incapable of penetrating the 60mm of the B1-bis - they were designed to pierce at best 40mm, which was more than the 30mm available to their heavier tanks, the PzKw IV ausf. C .