They've shut down much more than Reader (seriously, who said anything about Reader? was that even a service a developer could rely on?). Even APIs they don't shut down, such as their OpenID login stack, they routinely replace (dropping a lot of the maintenance and support, which leads to weird failures) with "exciting new APIs" that have no migration path, such as with G+ Login (I am thankfully safe from this issue, as I did something crazy with Portable Contacts that have me Google user IDs that I started storing before we even knew what they meant; so, to be clear: I have very little personal axe to grind on this, but others should be wary).
They thankfully decided to just go commercial-ish with Translate, but the same can't be said about Charts (which had a long deprecation window and a replacement, but the replacement is a fundamentally different kind of API that has different browser requirements and even different charting capabilities). They also happily will just shut down things like Google Checkout and offer no replacement at all for key use cases like "sell a physical product" (if you sell digital goods, you might be able to switch to Google Wallet Objects, an "exciting new API" released a couple weeks before Checkout was deprecated).
Google Checkout was certainly also targetted at enterprises, had a clear business model behind it, and had existed since 2006: everyone who built on that one (again, not me: I avoided Checkout like the plague) got only six months to migrate to a different provider (and figure out how they are going to handle any refund requests from recent customers, which will surely be horribly irritating as they won't be able to just tell Checkout to refund the transaction anymore). There is simply a patterned lack of care for people who may have built things on their stacks.
(Yes, some services have deprecation policies, but let's not forget that those guarantees were themselves attempts to regain faith due to a previous round of services that had been axed with little warning ;P. After the anger died down from that they started reversing course, shortening or removing the policy entirely after the previous guarantees expire. I can only imagine the people who keep citing these deprecation policies don't have much memory of how this has all been going down over the past few years ;P.)
http://googledevelopers.blogspot.com/2012/04/changes-to-depr...
Yes: you might be able to find alternatives to migrate towards... but if, by just acknowledging this pattern, you could avoid that bullet--which could easily come at the "least convenient moment" (such as when you now have some competition out of nowhere while attempting to launch a new product and raise finding), requiring you to suddenly drop everything for a couple weeks coming up with a new implementation of key infrastructure before the clock runs out--why wouldn't you?