This was hard to answer, I had to think carefully about weather I thought each one will decline, or weather I want them to decline. In short IMHO: Amazon - Nee

This was hard to answer, I had to think carefully about weather I thought each one will decline, or weather I want them to decline. In short IMHO: Amazon - Needs to clean up the 3rd party seller mess, but that will just make them better. They still offer good service. Netflix - They're being replaced (unfortunately) by a bunch of different streaming services so they will never have as full a catalog as they did. Apple - Hmmm. Still making great products people want to pay for. Probably near their peak customer value like MS circa 2003. Facebook - Just make it go away. Doesn't mean it will though. Google - Fading in search relevance but hasn't been displaced yet. They'll be here for a while longer. So I'm going with Netflix as most likely to decline over the next few years.