my point was trying to be, that in the environment on ONE computer, a single DHCP point in a complete secure environment, being ONE computer not connected to anything else other than the router (which is already in place), this isn't any more a point of weakness than the current environment of DSL coming in to a modem, to a router. The greatest point of weakness here is the router, and possibly hacking of the wireless broadband, but again, it isn't more weak than now (other than possibly the DSL being a wired signal and not the wireless)

As for a corporation, of course they would be interested in shutting down anything that could share the internal or external internet connection with anything more than the one DHCP, MAC or Static connection per desktop within the LAN. With ICS enabled on a corporate LAN, one could simply share the ethernet connection via the computer with a rogue AP and then boom, one could have potentially access to AT LEAST that one computer, if poorly configured.

I don't see that as being the risk, threat or concern here, since this is one computer, not on a LAN.

The point is ICS itself isn't some insecure protocol by nature, it is merely a bonding of two connections, and then a creation of a virtual DHCP server (that one can also be configured as a single static address though)