Even if that case the rest of SH will get fights in upcoming arcs .
Anyone that think other wise just not reading the same manga with how the final arcs set up .
They will get fights, but their importance will dwindle while luffy gets all plot highlight.
What is zoro going to do outside of mihawk fight?
Does sanji even have anything else plot relevant involving him?
Franky did Jack shit inside the ENGINNER GENIUS SCIENTIST ARC.
Robin will get kidnapped by blackbeard and reads poneglyphs so she's gucci.
Chopper will get the cure to laugh tale disease and bounce.
Jinbe doesn't even have plot importance outside of baby-sitting and fighting fodders hahahahah.