What sites are disabling TLS 1.0? According to the SSL Pulse report[1] it's the most-supported version of SSL/TLS by far (99.7% support). TLS 1.1 and 1.2 are disabled by default in older versions of Internet Explorer so not supporting 1.0 would lose those viewers which is enough reason to keep it enabled for almost all HTTPS sites.

[1] https://www.trustworthyinternet.org/ssl-pulse/