I really don't think you should get a WiiU... especially since the NX is more or less officially around the corner.
To be honest, I really like the WiiU itself; however, it's more trouble than its worth, and BigN really needs a new system now. I would actually buy one if I could just for Smash Bros, Xenoblade Chronicles X, Zelda... and maybe even FF5, as well.
Listen, if no one bought The Calling (a good idea that had flawed execution) for the original Wii, then the market might not be there for FF5.
http://nintendo.about.com/od/toppicks/tp/The-10-Spookiest-Wii-Games-Of-All-Time.htm
There
are fans of course, but every sale counts with the WiiU. There's that ever-present lack of third-party support to consider, as well.
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In the meantime though, I really don't feel like buying one if Nintendo's next big system is coming out in about two years (the release date is theorized to be around fall 2016).
For all of their flaws, they've almost always have been able to bounce back eventually. Besides, they're still in better financial shape than Sony, so at least they have that.
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If you think having a petition for FF6 is bs, then wait until you hear about Virtua Fighter: Final Showdown. People have waited ages just to be able to get their hands on it.
We're still waiting for Shenmue III, by the way. Sleeping Dogs are able tide us over with their
own "Far East" simulator for so long.
The Yakuza series are also great, but like FF5, there's no guarantee that it'll come out in the west, either.
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Back on topic: While I don't know much about the FF series itself (outside of the haunted village in the second installment and that the first is "based off of a true story") I will say that as long as they don't change the formula too much, I don't think they'll have to worry about upsetting fans.
I just hope it'll end up being decent. 7 hours of quality gameplay (even with a shoddy story) is more than enough to ask for, imho. I wasn't as enamored with the characters in any of the FF games as I was with other horror series, but I don't think that I really have to be.
For instance, I didn't need to be all that invested in the Amnesia and Penumbra characters in order for the game itself to be effective -- so I think the same holds true in this case.