Hey Steve! My belief is that it is unlikely there would be any more ARS songs coming to the site. I also see they have removed the link to the song request forum. But I do have a direct link to it if you'd at least like to try and submit a few suggestions to HQ:
https://guitartricks.typeform.com/to/rmHzhK?f=58
Cheers!
Mike
Keep rockin!
Mike Olekshy
GT Guitar Coach