I recently had to reset a DSRM password as the existing password had been lost. There is absolutely no implications or downside to doing this at all (but there could have been if we needed it and had no access to the DCs).
To reset the password:
Click, Start, click Run, type ntdsutil, and then click OK.
At the Ntdsutil command prompt, type
set dsrm password
At the DSRM command prompt, type one of the following
lines:
To reset the password on the server on which you are
working, type:
reset password on server null
The null variable assumes that the DSRM password is being reset on the local computer. Type the new password when you are prompted. Note that no characters appear while you type the password.
-or-
To reset the password for another server, type
reset password on server servername
where servername is the DNS name for the server on which
you are resetting the DSRM password. Type the new password when you are
prompted. Note that no characters appear while you type the password.
At the DSRM command prompt, type q.
At the Ntdsutil command prompt, type q to exit.
