Loot from the Cezchoslovakian Republic and Poland would have sustained the nazi government for another year or two, into 1941. Delaying the economic problems would have depended on either negotiating a peace (which would not have solved the long term problems) or conquoring another batch of wealthy nations to loot. But, I'm not sure if Goering or the other senior nazi leaders understood this very well.

Were war with France & Britian to continue Goering did want Holland & Belgium as bases for his short legged Luftwaffe. The bombers & fighters had trouble reaching targets in Britian & beyond eastern France. Conversely Goerings belief in the Luftwaffe may very well have caused his to select an entire different set of plans for Case Yellow. Neither Manstiens plan for attacking thru the Ardennes, or the final Sickle Cut plan existed in the autum of 1939. It is entirely possible Goering would have neglected improving the plans for the ground attack, depending on a grand air battle to defeat the Allies. The likely result of that would have been a indecisive victory leaving the German in possesion of some Belgian & French industrial cities and usefull airfields, and both sides exhausted by battle after a few months.

Alternatly peace may have been negotiated, leaving the new nazi government to wreste with the mysterys of gobal economics, national & internation banking, industrial policy, & dealing with a population that was expecting all of Hitlers promises to be delivered.