The area they are invading is nice flat farmland. I don't think this is a fight the Kurds can win without our air, artillery and ISR support. When your neighbor can easily kick your ass, the best thing to do is avoid war with them.
The Kurds have lived in Kurdistan, and various regions of Iran, Turkey, Syria, etc. for a very long time without having the U.S. protect them. Obama sent the troops there to Syria to begin with. It’s time for those troops to come home.