There is a lot more to it than just a smaller engine working harder.
Turbocharging is more than just hanging a turbo on a stock assembly line engine. Everything is different from the basic block on up.
Blocks are made of stronger alloys to keep them from cracking or flexing. Rotating parts like crankshafts are forged instead of cast. Reciprocating parts like connecting rods and pistons are made of stronger materials and are forged rather than cast. Electronics are programmed to get the most reliable performance and durability. All in all, a turbocharged engine is a completely different engine than a naturally aspirated engine. Most likely they will outlast a naturally aspirated engine.
Another poster made a comment about turbos on gas versus diesel. The big difference here is the nature of the engines. A diesel does not throttle the air intake while a gas engine does. That means that a diesel has a higher flow rate and higher gas volume driving the turbo at lower speeds. This makes a diesel more naturally suited to turbocharging because the turbo will spool up faster than on a gas engine. That is the reason that there is a "turbo lag" on a gas engine in many cases. That calls for a different driving technique for a turbocharged gas engine - keep the RPMs up.
The big advantage of smaller turbocharged engines is that if you drive them "gently," they should use less fuel because you are feeding a smaller engine. Once you start putting your foot down, the advantages of a smaller engine disappear.
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