I have no objections. Link is the player character, and as such, he ought to have the player's handedness if that's helpful. It probably proved too difficult to provide both options, so they made the choice that worked best for 8/9ths of their customers rather than 1/9th.
There's another obvious point here -- even if all past Links have been left-handed, that has no bearing on this one. The Link of Twilight Princess is all-new. Zelda's not like most series, where the main character is the same guy (or gal) every time.
Anyway, the last word in videogame character handedness is
this Bob and George strip from when George had just got an eyepatch.
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FiveMinute.net: because stuff is long and life is short
[03:17]
FiveMinZeke: Galactica clearly needs the advanced technology of
scissors, which get around the whole "yanking on your follicles" problem.
[03:17]
IJD: cylons can hack any blades working in conjunction