One or two expansion size ones with additional minor DLC is the norm in my opinion. Perhaps though Skyrim will be different. Although I imagine in a year or so they will be done and release a final GOTY edition.
Bethesda did not only make Oblivion my friend. Fallout 3 and New Vegas prove my point quite valid
Edit: How is Oblivion even comparable? Sure it is the same series but bethesda even stated they were attempting to go off Fallout's example...Besides New Vegas and Fallout 3 are newer than oblivion....Oblivion came out in 2008


