A lot of people are talking about STH status and renewals dropping because of the roster news, so not going to quote everyone in this reply.
There are a multitude of reasons why STH aren't renewing and lack of significant roster news shouldn't really be one of them. Yeah, it's frustrating not knowing what's going on with the roster and it always seems NYCFC is always a step or two behind every other team when it comes to releasing info, but that stuff shouldn't really play into not renewing a ticket. The lack of a stadium would be issue number 1. I know a lot of season tickets that were sold year 1 were corporate seats. I also know a lot of them didn't renew their tickets because of the lack of stadium movement. Casual fans being priced out of tickets for either travel pricing, ticket prices or whatever pricing increases occur. And then you have the big elephant in the room: it's cheaper to purchase tickets on the secondary market than it is for season tickets. I was able to get great seats for a game last year (I don't recall who we played) for $8. That's insane. There are no significant perks to being a STH aside from the rewards program, and even then most of those are meh or are won by the same 6 people. Once the stadium comes in 2067, STH renewals will come back up. Not because of lack of roster news.