Let's.
Errr... now that I thought about it the topic's name is very depressing...
Unless I messing something up...
Let's = Let us
Lets is a form of let in 3rd person. I.E. he lets go of a ledge and falls. And there's the "let go of hope" common saying...
Never mind that. I agree, the whole concept sounds fishy. Come on, an MMO... based on Fallout... But perhaps I'm messing the smell of fish with something else... I mean It's wasteland, there's no fish in here... well maybe a whale, but no fish.
And seriously the setting really fits "free-pvp & harsh penalty" type of game. Actually there's a project that added MP to F2 that strongly illustrates that. The project itself isn't to bright IMO but it is a good proof of concept.