To answer in a really simplified way (if I understand it right)
Bakkt will be the first trusted/legally accepted 3rd party who will link companies/people with bitcoin, solving the problem of the big investing funds and other investors who are not familiar (and in the future don't want to be familiar) with bitcoin and just want to trade it.
This is not the original peer-to-peer version of the usage of bitcoin but if we need this for mass adoption and acceptance, well, let's see how it will happen...