Look at the trends; duplexes were in HUGE in the early 70s (look at the Rosscarrok or even Montgomery areas). You'll note that there are tons of duplexs left, and all them are now all run down rentals. Given the choice between attached/detaches no one in their right mind would prefer to live in an attached home, and resale value suffers immensely accordingly once all the high-end finishes wear off, which command the high prices to start with.
And you can bet once the other side starts getting rented out the upkeep/maintenance and quality of neighbors is likely to go down. Sharply. Because, guess what, you're attached....forever
Sorry to sound whingey, but I just see these attached duplexes as the perfect summation of our society as a whole nowadays: Everyone wants everything in terms of bells and whistles right away, even if they can't afford it.
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