If it can´t run unlicensed software then it loses the advantage of using WinCE as it´s os. It loses the enormous softwarebase thats the aadvantage of running WinCE.
Then I´m better off with a regular PocketPC PDA and a gamepad add on. Can get both keyboard, mouse and full-VGA too with a real pocketpc.
The GP2x has the advantage of tv-out, linux and realizes that the homebrewers and emulatorcoders are allies not enemies.
Both loses to PSP or DS that have the advantage of commercial games and largest userbases.
I can´t think of why anyone would want a Gizmondo it sucks as a phone, suck as handheld game, there is better gpses out there if you really need one, suck as a pda.