Technically, the declaratory judgment does not require Trump to do anything. In practice, if 2d Cir (or SCOTUS) ultimately affirms ruling, Trump would likely comply by unblocking everyone, or there will be follow on lawsuits easy to win by those blocked.https://twitter.com/donmoyn/status/1004009869412847616 …
This is technically true, but I cannot imagine Trump continuing to block people, even if he wanted to be recalcitrant, because he would not know who has venue in the 2d Circuit. And not correct if there is a SCOTUS ruling.