I would try it out and see how it works.
Speculation was that the Dragonmarked heir would keep the marut down, but the dragonmarked heir hasn't actually been showing up in large numbers from what I can tell--CG bands seem to be the flavor of the day (and that's CG bands without the dragonmarked heir) and people even seem to be having success with forgepriest bands that don't use the dragonmarked heir (recently, I think there were two winning bands that were Forgepriest, wartroll).
The other banes of the marut--arcane ballista bands and Korducopia also seem to have taken a backseat in current tourney reports.
So, a lot of the marut's old nemeses are on the way out. On the other hand, the new bands present some challenges to the marut. A 3x bralani band, for instance, would probably leave the marut at 35 hp through their non-elemental lines before engaging and, on many maps (dragondown grotto, for instance) might never give you the option to engage them. A multidancer band might similarly shadowjump in, score an easy kill or two and then shadowjump out, leaving the marut to pointless trudge across the battlefield in the vain hope of ever getting a swing off. (And even if it did, defensive roll would let them ignore the first swing).
So there would be challenges to overcome in order to run the marut successfully, and probably the biggest problem is that you cannot mitigate all of those challenges with the same map (the maps without walls tend to also be unfavorable to non-flying speed 6 large bases, for instance), and in any event, you commander 3 is not high enough for you to depend upon map selection as your primary defense against the currently popular bands. If you think you have strategies that would give you the leg up against those bands, then by all means go for it, but MCB (marut/coatl/bodyguard) isn't my fist pick for the current environment.