Not high priority, but is something useful.
Where I work, we have several old virtual machines (some are build machines, others used mostly for continuous integrations and so forth) that run Ubuntu 10.x, where the default python version is 2.6.
Nobody wants to upgrade them since it's a hassle, and when we want to write code that will run on these machines as well, we have to use 2.6 syntax.
I think that this is a pretty common situation in tech firms that have been around for a while.