The issue has not been so much Syrian "allies" but how their business partnerships would play things out with them as long as they are still getting paid.

The Russians will do business with the Assad regime for as long as they are getting paid.

The Iranians are likely to try and play both sides on the internal Syrian conflict, and then will more permanently ally themselves with the eventual winner. I think right now they would be functionally mostly on the side of the Assad regime, since Assad is aligned with Hezbollah which is pretty much permanently the enemy of Israel.