I'm near certain there will be no cancellations...going triple daily to NYC was only just announced. This article includes a quote from SQ on the new schedule increase. Additionally, the EWR flight was just added to the VTL list a couple days ago. Even during some of the darker days of the pandemic the JFK flight operated regularly with no more than a handful of pax. Thus, I wouldn't look at the load as as a sole determiner.