General consensus is that a regular firmware update won't even be able to see that the mod is installed let alone do anything about it. There is a possibility that new Wiis produced will disable the use of this modchip by way of either:

1) blocking access to the solder points by putting a glob of epoxy over them or something
2) changing the DVD firmware of new revisions making the code in this chip obsolete

Either way, if you have a Wii already, you'd be best safe to wait and see how other people (like the site reviewers) fair. If you don't have your Wii yet (like me) hope you get one before any hardware revisions come out.