Indeed, AA has been very careful about releasing C inventory. A quick search on expert flyer shows only 2 seats available out of dfw for the first week of February. But since you aren't really investing in anything by using miles, go for it.

The one tip is to ask to upgrade early, since if there isn't inventory you'll be waitlisted. Many FTers note C inventory opening up (aka, SWUs and mile upgrades "clearing") as late as at the gate for Asia, especially on newer aircraft like the 787.