People saying after Obito's death , people will be trapped inside are wrong. What if a FTG user appears and marks both the worlds ?
OT: I think Kamui world should be used for secret things like CIA head office (or parallel ANBU HO). Also wars cause way too much destruction and can be fought in Kamui land. Would save ordinary citizens and loss to property. That would help Nagato's village. For normal life , people can live outside
FTG cannot teleport a person from one dimension to another. If that was the case, Kakashi would have teleported back to the battlefield here [
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] but he didn't. Naruto once gave Kakashi Kurama's chakra [
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], and that chakra was linked to Minato's chakra when Naruto fist-bumped his father. It was stated by Sakura that the chakra Naruto handed out to everyone never disappeared completely [
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]. However, Kakashi didn't receive a chakra-boost there (everyone else who had Kurama's chakra did) and wasn't affected by Minato's FTG when he was in the Kamui dimension.