Damn, lots of stuff happened without me noticing.
I think the Avengers effect is exaggerated to the point of absurdity, frankly that little term should have been named after TASM2 for all it did, but there you go.
I'm all for Jackman finally hanging up his haircut and letting someone else step into his adamantium skeleton. He's had a good run but seriously, Wolverine, power-wise, is just not that interesting of a character. And his novelty as a tragic hero has also worn its welcome more than enough. Let's get some new blood in, let him blend in with the crowd, and when a storyline comes along that revolves around him, put him in the midst of a team like Alpha Flight or something so we can see how he doesn't get along with his own allies/friends. The Wolverine was just so empty it really served no purpose and wasn't even entertaining.
History has changed thanks to DOFP, we don't even know if Logan still has his adamantium implants or not because of Mystique impersonating Stryker. Wolverine 3 would really have to up the ante, maybe show what happened in the interim thanks to the changed history. Maybe he bums around Canada for a while before meeting back up with Xavier and the school, hanging out with Alpha Flight and being a government merc. It could be how he meets Deadpool for the first time, and since this would be the 3rd Wolvy movie, it would be the perfect time to introduce the trinity of Daken, X-23 and of course the original. Maybe Omega Red could be the big bad for that movie, we haven't seen him yet and it would be awesome to see how they'd have Wolverine fight an opponent who seems too powerful even for his adamantium claws to overcome.