They can get closer if they want: they have nothing like Stukas (in fact, no effective ground-attack plane at all), and they still won't use tanks effectively. France had a lot more tanks than Germany did, and in the few times that they did something close to massing them, they were able to hold off repeated German attacks. The problem is, however, that the French and the British adhered to the wide-front doctrine, which had them parcel out tanks with infantry, rather than grouping them together.
So, unless France is able to increase its output by several hundred fold in that one week and make enough tanks that every single part of their line has more tanks than the Germans have, there is no point. If Germany has 500 tanks and throws them at a single point, and France has 15,000 tanks spread along a front hundreds of miles long, the point that the Germans will strike will invariably have far less tanks than the Germans are committing. French tanks are also too slow to do anything about this once it all hits the fan; all the Germans have to do is go through.
This is really like comparing infantry and cavalry; in this case, the infantry has far better equipment and armor than the cavalry, but the problem is that it is unable to catch the cavalry. All the cavalry has to do is punch a hole into one place and go through, then the infantry has to react
So, unless France is able to increase its output by several hundred fold in that one week and make enough tanks that every single part of their line has more tanks than the Germans have, there is no point. If Germany has 500 tanks and throws them at a single point, and France has 15,000 tanks spread along a front hundreds of miles long, the point that the Germans will strike will invariably have far less tanks than the Germans are committing. French tanks are also too slow to do anything about this once it all hits the fan; all the Germans have to do is go through.
This is really like comparing infantry and cavalry; in this case, the infantry has far better equipment and armor than the cavalry, but the problem is that it is unable to catch the cavalry. All the cavalry has to do is punch a hole into one place and go through, then the infantry has to react