The problem is that burning forests and cities to make pasture doesn't feed the horses in the short term - aka the campaign season.
And I find it rather unbelievable that the Hungarians represented the only chance Europe had to face the Mongols - sure, the European armies would probably not fare much if any better, but they still exist.
Meanwhile, the low countries are not the financial center of Europe at this point (nor are the Italian city-states - in practice, Europe's economy is not such as to have a "financial center" that can be gutted with disaster across the continent).
Besides, doesn't this assume that all the Mongol plans go off without a hitch? That seems unlikely, and I say this with all due respect to Mongol competence - they made mistakes and underestimated things at times, that over the course of conquering Germany and France they wouldn't is unlikely.
And I find it rather unbelievable that the Hungarians represented the only chance Europe had to face the Mongols - sure, the European armies would probably not fare much if any better, but they still exist.
Meanwhile, the low countries are not the financial center of Europe at this point (nor are the Italian city-states - in practice, Europe's economy is not such as to have a "financial center" that can be gutted with disaster across the continent).
Besides, doesn't this assume that all the Mongol plans go off without a hitch? That seems unlikely, and I say this with all due respect to Mongol competence - they made mistakes and underestimated things at times, that over the course of conquering Germany and France they wouldn't is unlikely.