It's a cost thing at the end of the day. Activision will put Call of Duty on the Wii U and it will sell enough to make it worth the cost of money and time. Treyarch has experience porting the COD games to the Wii U anyways.
With Destiny there's no guarantee it will sell well. Third party games don't do well on Nintendo home consoles. Bungie would have to put the time into porting it to Wii U or get someone else to.
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That not true, third parties have shown well to do. The problem is when you make game for wii u it comes out to late thigns are taking out no dlc no fast patch work etc... Than devlopers ingore what they took out and say "see it does not sell"