I really wish that they would have worked out. But at least we got an amazing song out of it.
Speaking of, I recently found an amazing fan made video for Back to December that completely cuts out the male actor and inserts Taylor Lautner. It honestly could be the official video, it's so good. Here's the link to check it out, you'll be glad you did!
link

I think it would be awkward.

"hey Taylor "

Then they would both say

"what?"