We are going to need a tank and not just any old run of the mill treaded beast, but something uniquely awesome. Tank Mechs are going to be essential to a ground campaign on various worlds due to the ever changing environments they'll be subjected to and and we are going to need something mobile, powerful, and meets the designs of our Spaceships as a companion vehicle out in those wilds against the better armed Cabal, Vex, and the Fallen that have been shown to be using mobile jointed platforms as well.
So I bring you link that should serve as reminder of why Japan is so damn awesome at times.
If the link doesn't work punch in the KR01 Kuratas robot to behold your mecha dream being realized.
[url]http://hight3ch.com/battle-mecha-robots-are-here-the-1-2m-kr01-kuratas-robot/[/url]
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I don't really think we'll see Assault type vehicles like Tanks and APCs. I think Destiny will focus more on the arcane power of the guardians instead of heavy artillery in straight up brawls.