[citation][nom]ProDigit80[/nom]The speed of N isn't the only benefit.Benefit is that N uses 3 (or more) antenna's, angled in different angles (preferably in X, Y, Z coordinates.)These antenna's can receive signal bouncing off of walls that a regular B or G router, and even SuperG routers with more than one antenna) have difficulties with.My Netgear Super G router was one router before Wireless N generation,and has 6 or 8 antenna's (forgot exactly how many), but all antenna's inside the router are aimed from the center outward in 360 degrees around the Y axis (the vertical axis).In other words, the antenna's are mounted in a 2D plane.Laptops with Wireless N often have 2 antenna's in the screen and one on the side of the laptop angling it in a XYZ 3D plane.So signal strength by receiving the signal through the best antenna, is probably more important on Wireless N than the total speed Wireless N has.Speeds of 300mbits (around 30MB/s) are actually good for routers with multiple computers connected, where not only a network is served, but also where computers share data in adhoc networks or environments.That way, eg: 2 computers could share files with eachother at around 15MB/s.[/citation]
For one I said most users don't need that much lan bandwidth. Most use their wifi to get the porn and facebook and poker from the router to their ass on the couch.
I'd also argue that there are too many factors preventing the scenario from working as ideologically as you describe. Whether it is only upgrading the adapter or the router and not both, incorrectly orienting antennas on one or both ends, placing one or both devices near a high-interference device (microwave, 2.4 dss phone, baby monitor, wireless computer peripherals...EVERYTHING), running a mixed mode network, ignorantly switching to narrow band or one of a hundred other things that go wrong...
Statistically, only a fraction of consumers ever needed more than 54mbps, and most of the ones that did have something wrong with their setup and are not getting (and may actually be losing) any extra speed or range.
I used to do in-home wifi setups for a small ISP...2 or 3 a day. I saw all manner of hardware (and mistakes). Say what you want about N-in-utopia but I stand by my opinion that high gain external antennas on a WRT54GL with the gain boosted to ~125mw (or more if you have a fan on it) costs less and eats REAL WORLD wireless N for dinner.