Originally Posted by
Mithrandir
Here's the thing. I had a Shimano 6700 10-speed shifter conk out on me after just 10,000 miles. That's what has me worried about being able to find replacements; I've already run into problems with the higher-tier stuff in just 2-3 years of riding. Now granted, the 3-speed shifter doesn't get used nearly as much as the 10-speed shifter, but still...
Edit: And God forbid I get hit by another car, which totaled my initial 5703's 4 years ago.
Something to consider on shifters is that while the higher end stuff is spiffier, the functionality of the lower end isn't bad. Tiagra and Sora will likely still be available in triples for some time to come. And, as with the lower level front derailer, there may be advantages to going to the lower end components. The "traditional" cable routing on the Tiagra and Sora is a plus. Cable replacement on some of the newer 105 and Ultegra shifters is awful and the shifters may not be as robust.