First of all it is a TRADEMARK and not a copyright. Trademarks do not expire. Copyrights do. The Navajo Nation has a legitimate recognized trademark for their hand crafted items that they want to protect and this law only applies to arts and crafts and not to generic items.
For instance, if you wanted to use the term Navajo for a brand of motorcycle, then the trademark restriction would not apply.
I side with the Navajo's on this one.
Especially if Urban Outfitters is intentionally or unintentionally giving the impression they are dealing in authentic Navajo arts, crafts they are seriously at fault.
In addition to a Trademark violation it is also deceit.
So you’re predicting bad news for my new business, the Coca-cola Cola Company?