I think that Tifa is meant to be thanking Aerith in that scene, but it would be a cool little shout out/fourth wall breaking if she was thanking the fans as well. ^^ It's been a while since I've sat through AC, so I'll have to keep an eye out for that scene next time I get around to watching it.
I remember in the very very beginning of the movie, there was a little dedication given to the fans by the creators:
To those who loved this world
and knew friendly company therein:
This "reunion" is for you.
I thought that was a nice message to read.
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