Theory on the ending *obvious and immediate spoilers*
I'm thinking the movie kinda made it a point to make sure we knew Will was a screenwriter and was going to write a Birdemic-type movie. So maybe the movie ended so abruptly because the writer died..?
Ending aside, I was so glad they worked Danny Weber back into the movie and how Damien Carter's song from the original was in the credits. Everyone in my theatre was singing and clapping along. Definitely try to see this movie in a theatre or with a group of friends who've seen the original.