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Interesting in principal. However due to gears being different sizes, they would only align while rotating such that they're repelling part of the time, and would attract an equal portion of the time. I think this would only work with a 1:1 gear - which is 4th gear in most manuals these days. And, the reduction in physical contact would only be as strong as the magnetic force, which is to say, probably millinewtons or less, compared with hundreds of newtons exerted by the engine that needs to transfer between the two gears, forcing them together.
There probably IS friction reduction to be found in manual gearboxes that simply isn't happening because nobody is building new manual gearboxes anymore. It's probably also not the lowest hanging fruit yet.
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