Well, yes. Just like I would expect a Rolex to last longer than a Casio, even if the Rolex doesn't keep time as accurately. Also, the fact that I am primarily a film shooter has probably colored my opinions about this, as all of my favorite film cameras are 40+ years old and still work perfectly and are serviceable for the foreseeable future.
I think the counter-example is the iPhone. I don't think anyone buys an iPhone (or any other smartphone) expecting to get more than 3–4 years of use out of it. An iPhone may (probably will) continue working a lot longer than that, but after that time period the OS will have become more resource-intensive, the battery will probably need replacing, and newer models will offer greater performance and many new features, so most will simply spring for a new phone. An iPhone, however, does not cost $9,000. [Edited to add: I think this planned obsolescence is terrible. I'm only offering it as a counter-example of what I would expect from a $9,000 camera. An iPhone you replace every 3–4 years is an expense; a camera that costs you $9,000 should be something close to an investment.]