I did that, and in the process, I got a few error messages. I know MySQL isn't up and running, that's sort of the point :-)

MySQL database failed! : DBI connect failed : Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) at ../web-lib-funcs.pl line 1360.

And then when I went to disable the MySQL feature in Virtualmin configuration, I get this:

Failed to save enabled features : The feature MySQL database cannot be disabled, as it is used by the following virtual servers : blabla.com blabla2.com blabla3.com