Given the size of the console market theres no way Bethesda will just leave it to the modders (and why should they? They are a business after all and console users are part of their market).
You're right. My response was a knee-jerk reaction to the term, 'DLC'. Actually, I don't have a problem paying for extra content provided that it extends playability by providing more quests, more explorable areas, and/or new weapon and armor items (which collectively could be considered an 'expansion'). It's just that I have unfavorable memories of purchasing DLCs that gave very little in return that I view them with such disdain. If Bethesda were to bundle smaller DLC content (like most of Oblivion's DLC, save for Shivering Isles and, perhaps, KotN) I would find DLCs much more palatable. This might not be the
most profitable technique for Bethesda to employ, but I think it would keep the console crowd from
feeling like they're being milked for every dollar. And, who knows, this 'bundling' approach might even entice even
more pc users to purchase the DLC as it would give them more content than if they were to find, download, and install a couple of dozen user-made mods.
Theres also no reason given that Bethesda is now a bigger company than it was in MW days that producing small DLC should stand in the way of producing proper expansions as well assuming they are profitable enough.
That doesn't negate the fact that they would have to devote some of their resources to creating DLC rather than using those same resources to develop full(er) expansions.