Anything can last forever if you maintain it. At some point it's really a rebuild with nothing of the original structure, but that's debating semantics. The pro

Anything can last forever if you maintain it. At some point it's really a rebuild with nothing of the original structure, but that's debating semantics. The problem is the effort/cost to do so. Concrete and steel structures are maintenance free for more than their architecture remains acceptable by ever changing standards of living. Wood, even laminated, requires very frequent maintenance. And not just for aesthetics and insulation but for the structural integrity to remain intact.