Are We Obsolete ?

It seems that the shorter a people's lifespan, the longer the things they create last.
Ancient cultures produced buildings, goods, and even gods who have lasted for centuries.
Is this a trait of "primitive" cultures?
Or did they understand the importance of sustainability?

Vegas is beautiful - but will it last?
Can it last?
Or is Vegas an example of our longer lives but meaningless culture?
Is Vegas an example of us at the apex of our evolution?

One only needs to look at buildings and products from only a century earlier to see this trend.
Cars, structures and products were built to last.
Now we fill our long and uninspired lives with things that look really good but that last only for a short while.
Everyday there is a new trend to follow, everyday there is a new upgrade to purchase, everyday there is a "new and improved" gadget that we seem to think we must have.
It seems that the longer our life expectancy the more things are planned to become obsolete.