While I loved the first film, I thought the ending was a great way to close this story, and it did not necessitate a sequel.
In the same interview, Liman said it was possible that Edge of Tomorrow 2 would be his next film, so perhaps there is reason to be optimistic that Edge of Tomorrow 2 will indeed happen.
While the script is still being worked on, the overall story seems to have been in place for some time.
Doug Liman previously spoke about how he had no plans for a sequel, but that fan enthusiasm and a great idea got him excited about the possibility.