Given that few game companies are organized as non-profit nor public benefit corporations (and many are in states without PBCs)... so profit seeking is required by law.
WotC, being a standard incorporation business in Washington State, is obliged to seek maximal profits within the scope specified in their corpora and bylaws as amended.
They're subject to board whims at HasBro - also a for-profit - and HasBro's in bed with WotC competitors for GI Joe, Transformers, MLP, & Power Rangers... using the "Essence 20" system.
If D&D 6 doesn't make money, D&D Tabletop might wind up on the licensing block... But, as long as it sells, there will be more... because the corporations involved are obliged to pursue profit...