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While the increased throughput of n is a substantial benefit, that's hardly the only one. Off the top of my head, 802.11n offers substantially more range, deals better with interference and provides a nice extra chunk of spectrum which will ultimately lower the noise floor and improve reception even further.
It's not hard to exceed 54 mbps, and that's assuming perfect-world implementation. Practically speaking you won't even see that much, and as HD streaming becomes more prevalent it's going to turn into a bottleneck.
Furthermore, even here in North America packages from Cable and emerging Fibre ISPs are up to or past 50 mbps. This stuff isn't as far off as you might think.
There probably aren't a whole lot of people right now who need the kind of throughput n provides, but bandwidth requirements increase over time -- there was a day (and I remember it) when a 1.5 mbps internet connection was stunningly fast. If someone's going to buy a new router, I recommend buying one that will provide the latest standard and thus won't be causing a bottleneck in 2-3 years or less.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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