As you've probably heard by now, there's a chance the New York Islanders won't be able to play the 2020-2021 season at the Nassau Coliseum. That presents an issue, as the Belmont Arena will still be a year out by the start of next season.
If we're operating under the assumption that the Coliseum isn't an option for next year (there are conflicting rumors out there but let's play the game for a second), the logical choice is likely the Barclays Center. It appeared the Isles played their final game at the Barclays Center, but with this new developing situation, the Barc may come into play for 2020-2021.