As a pr in Canada

[Renadxb]

Need advice
After getting the Dropbox waiver for B1/B2 being refused and passport sent back and asked to come for an in person interview .As the interview slots are really a long wait ,don’t know if I would get to reschedule for any earlier date and presently being an pr in Canada ,was wondering if supposing I get my Canadian citizenship before the interview date and then I would not require a visa for US .In this case what happens to my interview slot and application,would it be a problem as on the ceac site it shows refused .Would this status refused always shows and would it create problems while traveling in future to the US as a Canadian citizen .Thanks
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