First I would like to say, if I rub off the wrong way please forgive me. I get into these debates really horribly. Though I do not wish to cause ill feelings ~
You have no proof to your claims of it disappearing, so no. Naruto obviously has RSM and his Rikudou Chakra, just as Sasuke has his Sharringan and his Rikudou Chakra. Firstly nothing proves that Naruto needs the power of all nine tailed beasts to use RSM. It does not state this in the manga, nor does it state this in the databooks. Only the WIKI says this, and I have recently talked to their moderators and they have no proof to their claims. Read this please:
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Next you act as if the absorbing of chakra was explained to be more than Naruto/Kurama's. It was not. Therefore Naruto not using RIkudou chakra in the movie equals to him losing the power when they never even showcased that? Do you realize how stupid that sounds, right? Of course substantially the amount of required knowledge for such actions does not justifty the incorrect means of idealism towards Kishimoto's work. Understand? StudioP made this movie, not Kishimoto. Manga > Movie. I don't know how to put this into the minds of the easily seduced.
To end this argument. Kishimoto has never stated Naruto lost RSM, so where do you pull this out? Kishimoto has never stated that RSM form requires all nine tailed beasts to form, merely Naruto can use their powers. I already proved that in the thread link above.
Kishimoto has stated Naruto and Sasuke will always be equal. How does BM = Sharringan?
It doesn't.
Could you imagine Kishimoto stating to SP to nerf the MC? It doesn't sound plausible. Be true to yourself, and the work he has given us. There you can find the answer. Not some half-assed written plot for the final "Naruto K11" movie.