Heh, obviously the west don't want to exit the world stage, the nature of their kind dictate that the only way they can prosper is to steal it from others, without which the natural condition of Europeans and their spawns is disease and poverty.
But it's also because of their nature that their decline wasn't a matter of will, their culture fundamentally lack the ability to independently prosper, their loss of ability to steal wasn't due to lack of trying, but because a culture that only knows theft is fundamentally inferior to ones who know how to build.
Their only real choices are if if they have a managed decline into middle powers, or an unmanged collapse into the dark ages.
Their violent nature dictate they will always choose the latter, and the latter is all that they deserve.