I seriously doubt a different or more faithful title would have made much of a difference to people.
In fact to someone who didn't know better, your title might have made it sound like John Carter was the Princess of Mars.
My titling is meant to sound like the titling of the other movie series it was inspired by-no more, and no less. And in the case of the others, it worked. I don't know how The Mouse could have missed those examples.
You are presuming it was the title was the reason why it didn't succeed.
<snip>
I didn't get around to see it because it looked like a CG fest with a bland lead. Title had nothing to do with it.
For me, the title and the trailers made it look very unappealing. I mean, it was just some guy leaping around pretending to be the Hulk. Bleh.
I eventually saw the movie and quite liked it. It had a few flaws but was solid enough to build a sequel or few from the source materials.
Just, the marketing was so woeful. Not having "Mars" in the title was a huge mistake imo.