Reasonable
It seems quite reasonable to disable an outdated and vulnerable network protocol when alternatives have been provided for years (newer SMB versions). It protects the immense majority of users of a class of vulnerabilities.
However, as Microsoft gets a lot of telemetry data from Windows 10 PCs, it should have seen that a few of its customers insisted on using SMB 1, and hence written a warning on the release notes of the latest Windows 10 update informing them of the plan, and perhaps offer a workaround.
Biting the hand that feeds IT
