Oh hell yeah.
"Dragonmarks are a major part of what makes the Eberron setting interesting and distinct from the core D&D experience." - James Wyatt, the D&D Design Manager for Wizards of the Coast Roleplaying R&D
This would be a massive overstatement in DDO terms. I think there is real potential here, for a minimal amount of dev time (in comparison to many other projects I've read about) .