shisuis eye does take decade to get its mangekeyo but if u have hashiramas chakra you can use it twice a day at least since danzo was able to use twice in one day. once against mifune and against sasuke where he diappeared and got behind him.
the thiongs that was most special about shodai's chakra is that he could combine two eleement to create a living element which is wood and plants . so basically i am saying narutos new powers may allow him to use it again or in another way. i mean think about now he has some random crow that cant do anything for a decade. i amsure there must be more to it or another way for naruto to use it sooner. what do u guys think
i can see your interpretation here which is good to see you using your brain unlike other people, but you have to keep in mind that itachi said "hashirams chakra" not 'another chakra thats totally different in substence, strength and speed but can somehow react to the wood element jutsus' , but then again no one knows what the ninetails chakra is TRULY capable of apart from mass destruction ,stamina and health.
moreover, I THINK that the crow/MS isnt going to serve anymore positive help, this is because the fight with naruto and sasuke will be based on them two ALONE, no help, no interference, its going to be part 2 of their previous fight that was at "the valley of the end", and when/if sasuke turns to the good side its going to be sasuke truly feeling that way , not from being put into a special genjutsu that might not even last long. and if thats the case then shisuis sharingan eye wont be able to be used on anyone else because it was programmed for itachis eyes and no one else. sooooo, the only thing left for the eye to take is not pleasant, either it gets destroyed and itachi goes back under kabutos control , or kabuto retrieves it and uses the dna in it to revive shisui himself (i will be looking forward to that one). O.O