There is a significant amount of people stuck on 2.7 due to platform restrictions; quite a few OSes still under support are using 2.7 as their system Python and

There is a significant amount of people stuck on 2.7 due to platform restrictions; quite a few OSes still under support are using 2.7 as their system Python and there's no incentive to upgrade these systems. Even if Python 3 was 10x as fast, sysadmins would hesitate to put what's effectively an unsupported version of Python on their systems. Massive performance increases would help to sway those who have the freedom to move to a different Python without being locked to their system, I agree about that much.