If you do not have a significant muscle separation - diastasis (identifiable when you lean over and relax your tummy and on examining your abdomen), and do no have loose skin then a tummy tuck would not benefit you and you would not gain much in exchange for its scar.
On the other hand, I would encourage you to stay away from Thermage. I have yet to see a positive result from it.
On the other hand, you would get some skin shrinkage nonsurgicaly from Sciton's SKINTYTE BBL treatment. In this office technique, infrared light is pulsed through a hand piece into the deep skin (of the tummy in your case) which shrinks the collagen fibers while the skin surface is kept cool. This is painless and may need to be done several times. I would prefer this modality in your case over a laser liposuction since you have not fat that needs to be suctioned.
Dr. P. Aldea