Are you serious? We aren't allowed to discuss Apple policy on their forum? That seems a little censored. What are they scared of? Maybe they might learn something.
They aren't afraid of anything. That's simply not what these forums are for. Further, there is no way to have a productive, information-rich discussion on Apple policy when that discussion 1) will not involve Apple (since, beyond the moderators, they don't participate here), and 2) will of necessity involve much speculation, since Apple is not particularly open about their policies or reasons for those policies.
I am genuinely interested in how long people believe their mac should last.
As numerous people have already said, the hardware is generally quite good and lasts a long time. I've got a 10-year-old PowerBook in a cabinet - still works, though at this point there's little use for it, since it can't even do wireless communications. I've also got an 8-year-old PowerBook that is still in active use at my wife's small business. (Ironically, they keep having to throw away their 3- to 5-year-old Windows machines that are only reliable in not lasting very long, but they keep buying them.)
If everyone says that I shouldn't expect my laptop - built by Apple, a $400b company - to last 2yrs, then I will happily give them my money. I'll feel stupid for doing it since I expected more, but I'll do it. If on the other hand the majority say they expect their macs to last, say, 5 yrs, then I will go in asking them to repair it at a discount.
You should be able to expect your machine to last 2 years, but that's a generalization. Anything can happen. No manufacturing process is perfect.
As to whether you can expect to get a 2-year-old machine repaired for free, the warranty is only 1 year. Apple has no legal requirement to repair that machine for free or for a discount. Apple techs do have a history of making exceptions and repairing machines for free even out of warranty, but that is entirely at their discretion. So, keeping in mind that techs are only human, you'll have the best results not going in and demanding a free or discounted repair. You'll do best to be nice and friendly, while also pointing out (in a nice way) that the machine has not experienced any serious abuse and must have had a manufacturing defect. (Assuming that is true, of course.) Apple may or may not repair it for free, so you'd best decide beforehand whether you intend to pay for the repair or not.