Not really, at least not everywhere. If you live away of sea, you will bot be inclined to eat seafood, also will be expensive. There are many cultures in which the diet does not have enough iodine.
Sure, if you live in a country with submodern infrastructure, doesn't produce enriched wheat, or cannot afford to buy an iodine supplement, you are probably right.
However 1 cup of milk has more iodine than 1/4 teaspoon of iodized salt, 1 egg has half as much, and two slices of enriched wheat bread has three times as much.
Also, a typical kelp supplement has way more than the RDV, in a single pill.