Option one: every product Google makes it supports forever regardless of whether it succeeds or not, where "success" for Google is defined as "billions of users". (Ref all the people laughing at why G+ was still going despite not being popular. [Note: I've read the 'unpopular' thing was disputed; I don't know the actual numbers.]) In this world Google can never attempt a product unless they've verified ahead of time it will become a category-defining product (Chrome, Android, Gmail).
Option two: occasionally some products will test the waters and fail.
I think it's easy to say at the time of a product failure (or even at launch: see the people who scoffed at iPod and Dropbox) to say that it was destined to fail -- it's pretty much guaranteed to happen on HN because people love to shit on and watch other people shit on others' work, for some sad human nature reason -- but difficult to see which of those guaranteed-to-fail products will actually eventually succeed. So option one mostly means you never launch new products.
Big companies faced with this dilemma (the Ciscos or Microsofts or even Facebooks) deal with it by waiting for startups to succeed then buying the result (Whatsapp, Instagram, Github). Famously at Microsoft if you had a good idea the correct way to implement it was to leave, implement as new company, get reacquired. That may become the case at Google too.
Instead Google tries to do option two. I think you could argue about the rate of launch/fail in category two but it doesn't bother me too much. I recall a comment from the Netflix founder about how they had too many successful shows and how that is a problem, that they were playing it too safe.
I also use emacs as my editor because I know it's old enough that it's not gonna change out from under me. When I care about reliability in this way I choose accordingly. Nothing in life in permanent; I evaluate new Google products like I evaluate random startup products, which is to say they may randomly disappear in a year and I factor that in. For example Keep seems like a nice product and I sometimes use it for grocery lists but I'm not gonna put anything important in it (disclaimer: I have absolutely no insider facts about Keep, that is just my feeling about it based on the previous reasoning).