I don't believe decadence is a useful concept in understanding capitalism. It makes sense in reference to the ruling elites in tributary social orders, which depend on each generation of those families being able to keep the coercive machinery going. Not in capitalism. The third generation of the JP Morgan dynasty apparently just enjoyed life as a rentier. That, in a feudal lord or a Chinese Emperor would have been disastrous, and the process can be reasonably seen as decadence. There is no way that capitalism can "decay."
But the point about the bourgeois individual is certainly accurate. The echo of the closing line of PL in the Prelude links the two poems in terms of CHOICE -- forced free choice. W not only CAN freely choose his place of rest; he must freely choose it, because in this world nothing is given. A&E before the fall did not need to make choices; they just did what they wanted to do. And a good deal of the enrgy of the poem comes from Milton creating for them the necessity to choose freely.
Carrol
Carrol