I have a feeling smithing/smelting is likely the biggest trade affected by the new changes. Granted, I've mastered it and likely won't have to try and do full hauls of ore any more unless something special comes up. But considering that you can get iron one level down, or at worst, two levels down, all this means is that you are making more frequent trips if you don't hire help.
Sure, you either pay folks to keep at the regular place of smithing/smelting, or you do it solo and not quite as fast. Still, magic bags will double the amount of ore you can haul. Invest in some. This isn't a game breaking change.