There is a reason why these lower profile coolers are a dying breed:
1) For most people (and more people now more than ever), the stock cooler is more than adequate. This is especially true on the Intel side, but AMD's stuff runs fine stock as well these days, so there is less need to OC, unless you are OCing just for the fun of doing it.
2) Tower coolers are cheaper. $20-30 gets you a rather effective cooler these days, most of which have replaceable fans if you happen to think the stock fan too loud. For those who have tons of money to sink on a sink, there are much prettier/effective options on the market in every price bracket.
3) Of the few people who need or want to OC their machines, pretty much all of them have a mid-tower which is more than capable of fitting a tower, so space is not a concern.
Now, with all that said, I can actually see a future where this changes: Parts are getting smaller and cooler all the time. There are already some awesome itx mobos out in the wild, and uATX mobos capable of high end xFire and SLi. If you look for them, there are some decent (though not amazing) lower profile PSUs on the market. Actuially, if you go down the list, the only part lagging behind has been the HDD, which is still relatively large, loud, hot, and slow. In the next year or so we will start to see 2TB SSDs (due to better firmwares, die shrinks, and tripple cell nand), which should still fit in the current 'laptop' style form factor. They do not need the same cooling as a HDD, and they take ~1/4th the space, so these small high-density drives should be able to breathe life into performance oriented mini boxes. At least for people like myself, where performance/storage/noise/size are all high priorities, this will make a huge difference, and may put myself in the market for one of these shorter coolers... though I could always leave the top off and have that tower sticking out like a giant tumor