It means people are finally taking "not in our name" seriously!!
While I wish that were true, it's primarily due to things like:
"For decades these laws were rarely enforced. Now, scrutiny of Americans abroad is intensifying because of the Foreign Account Tax Compliance Act, or Fatca, which Congress passed in 2010. The law’s main provisions, which took effect in July, will require foreign financial institutions to report income of their U.S. customers to the IRS."
Also, the article is vague, if not inaccurate:
"The Treasury Department is required by law to publish a list of the names of people who renounce quarterly. The list doesn’t indicate when people did so or why. It also doesn’t distinguish between people giving up passports and those turning in green cards, or indicate what other nationality the individuals hold."
Giving up a green card is quite different than renouncing citizenship. It could easily mean that a lot of people with green cards are choosing to return to their country of origin as the economic, social, and political climate continues to change in the US.