I'm hoping that we just don't have an ending where Ted walks up to girl in the band, says hello, and we get a 1 second shot of the her saying hello back and then it kicks back to his kids with: "And that kids, is the story of how I met your mother." Roll credits.
I fully expect that to happen. And it will be Lori Loughlin, a CGI Lori Loughlin.
Or SMG.