User blog comment:Videogamep/The Future/@comment-24769684-20150904021615

Option 3. Luffy is on an adventure, not a warpath (although he's been on plenty of warpaths now). He wants to set sail with his close nakama, not babysit 5000 pirates. Of course, he won't completely abandon them, and I think sake cups may still be exchanged. I agree with most of the users that I've heard, that the alliance will really come into play in the battle against Kaido. Plus, I'm sure Luffy respects their dreams of adventure and wouldn't want them to spend the rest of their time doing only what he does. All those characters would simply detract from two characters who are evolving into central roles: Law and Jinbe, the latter of whom is basically confirmed as the next Straw Hat.