IMO i dont want a 4 year arc, issue is Oda spent 1.5 years with the boring prewar stuff, that easily could have been cut down as well
This is what we have below the dome
Robin, Brook
Nami, Usopp
Marco
Chopper
Jime
Franky
Then
Scabbards
Momo
Yamato
Yakuza
Drake
Then there is the flower capital, and all the additional stuff in between. Oda is going to find a way to wrap up the supporting stuff sooner rather than later, but I do not think he is going to spend that time drawing all those fights, each SH from here out will get their one chapter and then spend most of it back on the roof because that's where the main story is