ANH: Luke, Red Five, is the Hero of Yavin. Wedge the other survivor of that squadron.
ESB: Wedge Antilles is Rogue Two.
Implication: Rogue One is Luke Skywalker, even in the Lucasverse.
Mark Hamill too dang old to portray his ESB-era self.
Mark Hamill is present in VII to compare to, making a recast untenable.
Disney probably wants connection between Rogue One and TFA.
Implication: Rogue One is a movie about someone else holding that callsign, closer to the TFA era.
Plot convenience for the sake of marketing: Rogue One still being a title 30 years later when even the roguish rebels changed the name of the squadron in a matter of years. With no guarantee their superiors are even rebels anymore, rather than a legit government.
Conclusion: Name is an appeal to EU and video game X-Wing fans, at the expense of precedent and in-universe sense.
And if not, and it has nothing to do with Rogue Squadron, the title makes no sense on any level.
I'm wary of Disney whoring out SW for money and PR only. Even GL had some artistic whims allowed to trump anything. Even he didn't make a title solely to sell toys.
Disney better make movies that are legitimately good. Cause that is the only potential upside at this point. And I mean better than Marvel.
I discuss to learn, not to win. Then again, learning enough tends to translate to victory in the end anyway.