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I think that more important than increasing that number is to prohibit a “maximum download speed” to be used as the advertised download speed if it is not attainable at least 50% of the time. I’ve had internet service from a provider that NEVER reached the advertised (and paid for) speed. It would benefit ISP customers if the advertised speed was required to reflect reality, and encourage more informed decisions regarding which service to purchase.
Apart from increased accuracy in advertised speeds, I would say that a 10 Mbps minimum download speed sounds about right for the threshold of broadband service. You can get by with a little less, assuming you have adequate bandwidth, but I personally wouldn’t really consider 6 Mbps to be “high-speed” at this point.