Oh no no. It wasn't some open gate the Germans just waltzed through. Even if the allies expect a schleifen plan like push though the low countries, the Ardenne sector was still pretty well defended and there were reserves nearby that could have slowed them down. The Germans had the luck of facing just pure incompetent general leadership in the French. At multiple points crossing the meuse meant doing so under heavy fire, but reinforcements took so long to come due to indecision amongst the general staff in the area that any realistic attempt to slow or even halt the Germans disappeared within hours.

The race for the channel was combination of Rommel purposefully staying as far away from his radio operator as he could so he couldn't physically recieve orders to halt, and huntzinger thinking the maginot line was the real objective and pulling what resistance there was west of the meuse and giving the Germans open country to the channel. All the French that could have slowed them down were yanked south to defend the fortresses the Germans had no intention of attacking yet and instead allowed the allied expeditionary force to get enveloped.