I think the power levels for the EoS Straw Hats are too low. Especially if you consider that the new generation will surpass the older one. Most of you are limiting their final strength levels to the levels of the pirates who came before them. Thought I most agree what everyone is basically saying about the Monster Trio, I disagree with the other crewmates.
Chopper - is already a city buster, yet most people think that after 12 more years of this manga he will only remain at that level. Im predicting that chopper with the combination of new medicine and rumble balls will achieve a form more powerful than Monster Point by the EoS. He will undoubly become what some would consider current admiral level, especially if he is taught to utilize Armament Haki. Chopper could potentially have the ability to fly by acquiring some griffin-like winged transformation, but this is very unlikely.
Nico Robin - By the EoS by advancing of her powers and learning armament haki, Robin should be a fierce force. Her powers should allow her to not only create full body giants, but also (given her current ability to clone herself) have the ability to make multiple copies of these giants which would all have access to haki. Nico Robin should also have the ability to fly via using her powers to create wings. This would clearly make her close to admiral level if not admiral level.
Nami - Should be a weather sorcerous, being able to create fierce storms (produce Large scale Lightning Storms, level 5 hurricanes, Typhoons, other natural disasters) that can destroy islands, and the ability to not only make herself invisible but grant her entire crew and/or ship the ability to become invisible. Nami should also have the ability to fly due to using her wind to lift and propel himself. She should be nothing less of vice admiral.
Franky - Franky undoubtably will be admiral level or somewhere near sanji and zoo's level (of power) by EoS. He undoutably will have met vegapunk by the EoS, and will undoubtably have surpassed him. His body will be the pinnacle of cybernetics and his weapons rival that of a buster call (Island busting). Franky should ALSO have the ability to fly, rockets (if you don't see this coming you must be blind).
Brook - Brook by EoS should have far surpassed Geko Moriah. He should be the Soul King of Death. His powers should evolve to the point of possession (living or Dead). His abilities to drawn upon the power of the underworld should be expanded on and be given the power to communicate with the souls of the underworld, and also temporarily raise weaker dead should to aid him in battle. Also, much like he can call the ice or hell to his blade, he should also be able to bring forth the flames of hell, and manipulate hell fire (much like ghost rider). He should also learn armament haki, as to protect his bone from breaking. This would put brook on high vice admiral level if not admiral level.
Now, I know alot of people may say, you can't have that many admiral level tier's on one crew. Thats not necessarily true, especially if you look at roger. From what we know Roger, Rayliegh, and possibly one or more other people (seeing how he was the pirate king so he must have had more then 2 admiral level crewmates on his ship) were admiral level or beyond on his ship. Now if you look down the line shanks also surpassed admiral level (who was on roger's crew), with years of growth and he has his own crew of admiral level crew (Benjamin + Roo). So its possible to have multiple admiral level crew members stem from one crew.
Also, i personally don't believe the admirals rate the strongest force on the seas.
Pirate King
Gorsei
Yanko
Fleet Admiral
All surpass admiral level in my point of view and they are multiple people who are admiral level in the OP world. Though i think the monster trio and possibly franky will be yonko level, the rest will become admiral level or top vice admiral level. Except ussop who was already confirmed to always being the weakest of all the crew, by oda.
In terms of what I said earlier about the new generation surpassing the old one, I mean in terms of the supernova's, by the EoS I see them all being Yonko level. Especially Law, Kid, Hawkings, Luffy, Zoro, and possible X-Drake.
This would create way more yonko level pirates that currently exist, which is why I'm saying that the number of admiral level opponent for this generation will also increase, many coming from the crews of these supernova's by EoS.
This is all only my opinion.