While I think this is an interesting point, at the same time, it looks like it may have been more difficult technically and brand-wise for google to migrate not

While I think this is an interesting point, at the same time, it looks like it may have been more difficult technically and brand-wise for google to migrate notebook to drive (which I think is the goal). It probably made more sense for them to discontinue notebook, which had a relatively small userbase, and relaunch it as a new product/brand under the drive suite.