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What will the power generation capacity of that roof be after so much time? Don't solar panels wear out?

yes they do and its a very valid question as to when you need to replace the tiles.

Realistically, Tesla's solar roofs will probably be usable for 30 years before needing to be replaced.

Obviously probably solar but it would last long enough to break even.

And, of course, you've got a free roof included with the purchase.

If it works perfectly and you never have to replace anything, yes.

But you aren't making the sort of "profit" you would if you just put that money into the market.