Agreed, the 17mm TS-E is too heavy, bulky and expensive, the front lens is very exposed, you cannot filter it and most people don't care about TS functions.
I have one, love it, but cannot recommend it for general photography, it's too much of a specialized tool.
It's time Canon's refreshes the old 20mm f2.8 and adds a 17mm f2.8 USM for half the price of the 17 TS-E.