NO country could be just bombed into submission. As I was saying, as early as the Spanish Civil War, there was a report on the terror bombing there, and the conclusion was that it just strengthens the will to fight of the people you bomb. You know, the opposite of wanting to submit.
The best theory anyone could come up with during the war, on how to use strategic bombing, was to cripple the war economy by targeting key areas that would affect everything else. The best example that worked was targetting the German refineries and oil depots, which did more to cripple Germany than all the terror bombing during the whole war, and cost only a fraction of the bombs and lives. And then there were examples that didn't really work, like trying to cripple the ball bearing production.
UNFORTUNATELY:
1. It was the allies who came up with that, not the Germans. And even the allies took a while to get that idea.
but more importantly
2. It depends on a series of key conditions, some of the most important being the existence of such concentrated key industries, your ability to reach them, and your ability to actually bomb them again and again to keep them out of use.
The latter was a huge problem for Germany. Even the Norden sight wasn't nearly as accurate as in the propaganda, and actually needed huge amounts of planes and bombs so some actually hit the intended industrial installation. But the Germans didn't even have that sight, nor the huge amount of airplanes to take out industry by carpet bombing.
More importantly, they didn't have the REACH for that. Britain is a big place, and if you can only reach the south-eastern coast, there's a lot of place where they can put their key industries so you can't even get to them. And in fact, that was already the case before the war even started.
Hell, even during the Battle Of Britain, when they could cover a LOT more of Britain than in '38, you may notice that the Germans hammered on airfields and whatnot in the south to try to cripple the RAF, but they couldn't (and didn't even really try to) cripple the factories that produced those planes, or any other industries that would hamper the input to those factories.