Yeah. What's sad is that Luffy is still 10x stronger than the rest of his crew (save maybe Zoro). So if Luffy can't stand up to anyone at admiral or higher level, then his crew is screwed. As a whole they're really not in this league yet.
Then again since Oda is specifically using this time to give everyone in the crew power-ups, Luffy has to get one too as part of Oda's major plan for this arc. Since this is the end of the arc, there isn't much time left so it's gotta be coming soon.
Plus you can't have an arc, especially a HUGE EPIC ARC like this where the MAIN CHARACTER OF THE STORY has no fights. At the climax of this Luffy has to fight SOMEONE and beat them. Who knows who he'll fight, but he'll probably need a power up to beat it.
My guess is he fights and beats either Kizaru or Akainu. Whitebeard is going to take on Sengoku, Marco is taking on Iceman. Bighead is still fighting Kuma. Donfla is with Croc. Oz with Jinbei. etc...
/note I think some of these fights may have ended already, but I'm not 100% on the timeline off the top of my head.