At this time TLSv1.0 includes support of older browsers and disabling it would cause issues with a good number of the browsers versions your constituents still use to access the site.

It says the following:

Note: SSL and early TLS are not considered strong cryptography and cannot be used as a security control after June 30, 2016. Prior to this date, existing implementations that use SSL and/or early TLS must have a formal Risk Mitigation and Migration Plan in place.

We will begin investigating whether it is possible for us to remove TLSv1.0 as an option and what impact that may have on older browsers.