It would be good to create an updated one. The tricky part is that gource expects a single git repository (or at least some sort of git commit history) and the ET is spread over multiple git repositories.
Presumably Frank somehow handled this last time.
A rough command line to use is:
gource --date-format %Y-%m-%d -1920x1080 -r 25 -s 0.04 --logo ~/websites/einsteintoolkit/images/logo/logo.png -o - | ffmpeg -y -r 25 -f image2pipe -vcodec ppm -i - -vcodec libx264 -preset slow -pix_fmt yuv420p -crf 23 -threads 0 -bf 0 et.mp4
though for youtube one would likely have to consider the advise on: https://gist.github.com/mikoim/27e4e0dc64e384adbcb91ff10a2d3678 and https://support.google.com/youtube/answer/1722171?hl=en