Nope
Can Obito react to Naruto's shunshin?
Doesn't have to, either naruto shunshins through him due to intangibility, or naruto shunshins in front of him to attack. But then naruto's striking speed comes into play & we already know that obito is faster than that. Either intangibility avoids the strike then obito counterattacks or obito teleports before naruto lands the hit.
I see a Minato vs Obito scenario going down, with Naruto winning because of clones providing openings.
Naruto isn't instant, yeah he's been compared to minato but that's simply because his shunshin speed was too fast for whoever was witnessing it to track, that doesn't mean he can do what minato did though. Naruto can't appear above obito in the middle of an attack, he needs FTG to do that.
then there's chakra arms.
Obito has avoided naruto's chakra arms w/o even resorting to intangibility, they'll hardly be a problem.
Thought this was just KCM naruto? KC
SM Naruto [if that's even a thing] would probably win if obito doesn't at least have the GM for support. He'd be overwhelmed & forced to retreat & w/ ma/pa naruto can constantly absorb senjutsu, so outlasting won't be happening either.
Obito has no way to put down Naruto so he'll resort to warping which leaves him vulnerable to attacks from Naruto's clones.
Obito made a clone disappear via madara's gunbai, he can use his massive shuriken to do that exact same thing & since we already have a canon demonstration of how KCM naruto + clones fare in cqc against obito then they all get killed, obito will have enough time to warp naruto away since his taijutsu w/ intangibility is above his.