Accepting Bitcoin directly doesn't sound ideal for consumers anyway unless they'll be accepting 0-confirmation or using Lightning.
I had assumed Bakkt would have to accept zero confirmation transactions anyway? Or do you have to "pre-load" your Bakkt account in advance before actually buying anything? If that's the case, this is a far less interesting development.
Still, I would have imagined Starbucks would be able to accept zero confirmation transactions, provided they had opted out of RBF. The chances of someone going to all the effort of setting up a double spend to save themselves 0.001 bitcoin on a coffee is tiny.