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I like MagSafe, but I like the idea of being able to charge my laptop with USB chargers even more. :)

What size adapter are you envisioning? An adapter in the 65-85 Watt range is going to be about the same size as the current MagSafe adapters, and you aren't going to able to charge the battery in a 13" retina laptop in any practical timeframe with a 5, 10 or 12 Watt adapter (if it will charge at all).
 
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