Pessimism. Soul crushing pessimism.
After all, everybody else is doing it. Why wouldn't they do it too? Especially for such an unlikely crossover like this.
There's pessimism, then there's lunacy. Nintendo seems to prefer avoiding those kinds of games period, they're not the kinds you'd want to make on consoles, and after FE's success with Intelligent Systems and Atlus working together I expect a proper game out of it.
Now mjr's pessimism, that seems more plausible.
Now you know why I referred to it as 'soul crushing'. I have a really bad habit of trying to find the absolute worst case scenario. And besides its not like 'less than an infinitesimal chance' == 'no chance in hell'. (Also, I really wanted to make that American Pie joke and the fighting game option had already been expended (plus what would you do if my batshit prediction had turned out to be the correct one?).)
The next question I have for this game though is will they be featuring new characters from both sides or will Marth and Roy be in it (and if so who do I need to fuse to them to make Seth and
Sigrud Zigludo)?
Also:

A crossover that wouldn't have been as :psyduck: as Marth's and Mara's Magical Adventures will likely be (not that what we're getting is in any way a bad thing).