It can - they may produce long-living tank-solid devices and sell for the price that would make it worth remaining in business.

We can lease them for a fixed amount of time, which would be cheaper. Or we can buy them, but much more expensive. Or, as it already often happens, we can buy them with some contract with a mobile operator attached.

There are lots of business models.

Hate to sound statist, but if you somehow account for externalities here, these can become more common.

Ah, also they may consider producing upgradeable modular things, so that you wouldn't have to change or recycle the box or the touchscreen, but you could replace the motherboard or the antenna, which are goods that can be sold ...

Situation would be better with better school education informing children what a fucking portable computer is and why it's not cool to buy a new one every two years and why these companies are bullshit.

Now, coming to the bullshit part - the incentive to buy a new thing every could become less if patent and IP laws were relaxed to some Wild West level. There would be plenty of companies and over time those with the business models I describe would gain reputation and faithful customer base, and eventually press out bullshitters.