What will be the result of a magnetic polar shift?

At the least the devices that use magnetic fields will need to be recalibrated. Like compasses and what not.
Birds might not be able to migrate properly.

The poles will melt, and the equator will shift. Flooding everywhere, agriculture massively screwed up for generations.

On the other hand, great opportunities for animal evolution.

Here what NASA thinks will happen !

They say it happens all the time last one was 800,000 years ago, it could take hundreds if not thousands of years to flip.

Not much.

@elbanditoroso Are you confusing magnetic poles with the planet’s axis of rotation?

All polar bears will be drawn to the South Pole.