You're using a BMW as an anecdote yet quibbling about Toyota's marketshare? Of course not every single care manufactured today will last forever. Some are junk. Some, like Toyota are quite good and with proper care and maintenance survive a long time. I could add Nissan and Honda to this group. There are other makers that are also building very good automobiles.
Today's automobiles are generally very reliable and with proper maintenance, long lasting.
My anecdote was about how new cars, including BMWs, aren't reliable as my old BMW.
Generally, I think a lot of older cars were built to be more reliable than cars are today.
The automatic transmission fluid in a new BMW is considered "lifetime" by BMW. BMW defines "lifetime" as 100000 miles. They advise to never change the fluid unless the transmission is being rebuilt.