I'd certainly think about it and would possibly do it.
If it comes out better than Watch Dogs. Because based on hype I would have considered buying that on WiiU as well, but I'm not really interested in that anymore.

Yes, only to support third-parties though. Activision, as much as I despise them, have always supported (not counting DLC) Nintendo consoles and the gamers that play them. I would never play it because there are too many other amazing Wii U titles but it is nice to give support those who support you back.

No. I love my Wii U and I have it, admittedly, for 1st party games. That's it!

Like others have stated, the online isn't stable enough (although good some of the time), graphics would be less, achievements/trophies (yeah I know..not important), etc.

Now I know some people say that graphics isn't important. While that's true, this situation would be different. You already know Nintendo would charge 60 bucks for this game. Why would you choose the inferior version of the game when there's 2 better options available at the same price? Not to mention the other pros.

I'm not above the Wii U getting that version for Nintendo players to partake in the game. I myself would stick to the PS4 version as it will be the definitive version.

Yeah, but than you should get in total?

I'm probably not buying it at all, but I'd say it would rise from 7% chance of purchase on my PS3 to 25% chance on my (future) Wii U...

PS: Petitions like this don't really have a goal...they just try to get as high as possible. The "goal" that is listed on the page is just the next milestone until a new "goal" is unlocked. Its subtle motivation to get more people to sign by the website (it does this on all petitions)

If it supported some of the Wii U feautures like off-screen or motion controls, and didn't have significantly more graphical slowdowns/glitches than the other console versions I would definitely consider it. I would prefer a PC version if one released though.

Depends.
Does the game have some cool gamepad features? if not, then why would I waste money on the game when I could get the PS4 (and if a WiiU version is made, then a PC version is obvious, right?) version? MAYBE I'd get it to support 3rd parties on WiiU, but that depends on the quality of the port...

This for me as well. 

I wouldn't buy ANY version of Destiny.. The game looks very uninteresting to me and no fancy GamePad features can change my mind..

I am not into Destiny.

Part of that because i am not into consoles MMOs, but the gamepad could be a way around that.
So maybe?