If it flips, it will be a gradual process over thousands of years and will not affect the earth’s axis or orbit. North pole will still be where it is now but the north magnetic pole will exchange locations with the south magnetic pole, basically a north magnetic pole is a point of influx and a south magnetic pole a point of egress of charged particles. So that’s what will change, and this has happened numerous times in the past. It would probably be 500-1,000 years at least before the current polarity faded out, then there is likely to be a period of variable and chaotic polarity, followed by the reversal. It does not happen overnight or even in one decade. That will be a difficult situation for navigation and also for human health as the magnetic field protects us from a certain amount of harmful ultra-violet radiation. A weaker field would stop doing that as effectively.
Thank you.