Didn't realize it was an option. Here in Texas, I remember being told that if you wanted to board a plane after a certain date, you needed the REAL ID. Now whether they were bullshitting me, I don't know.
I'm also in Texas. In 2008, when the Texas DPS began getting ready for the Real ID requirements, the state started requiring a birth certificate for a new or renewed dl. I saw many people getting turned away from renewing their driver's licenses because they did not bring one in (even though mailed the renewal notice clearly stated that the applicant was required to bring their bc in).
While there are alternatives to a Real ID to board a plane, good luck getting a driver's license renewed without meeting the real id document requirements at the TX DPS!
ETA: They also required applicants to supply their SS card.