>> They did this with Google Reader 5 years ago. I don't think you can trust the longevity of Google services beyond GMail and Google Search.
> Well, hardly anyone was using it. How long should a company maintain something for free that not many people are using?
You misunderstand. He's not necessarily saying Google should maintain Google Reader or Google+ forever; he's saying that users can't trust Google to keep all but its most popular services online. If you like some new/niche Google service so much that you'll be unhappy when it's shut down, you should seriously consider not using it in the first place.
I'm not sad to see Google+ go, but the aggressive rate of metrics-driven product shutdowns by modern SaaS companies is a self-fulfilling prophecy. Users learn not get used to new services and hold of using them heavily, because they'll probably get shut down; that dampens adoption so services inevitably get shut down.
IMHO, SaaS companies need to embrace niche products, otherwise they're eventually going to kill off a lot of consumer appetite for innovation.