Deleuze mentioned on HN? I'll have to check my window for aerial pigs come the morning.
> when the Earth had open, undefined spaces
For physical spaces, you're correct, but it is worth noting that other spaces have appeared and thereafter made the same transition. The internet, for example, is a pretty clear-cut case of a striated system today -- it facilitates desires into tightly-controlled pathways and channels by which means value can be extracted. But in its early years, it was almost totally smooth: communities like Geocities and MySpace demonstrate this through their total stylistic incoherency. While it is of course different than actually going to a new place, it's still a rare thing -- to experience a "totally new" place, unblemished and unoccupied.
And it's not impossible for striated spaces to be deterritorialized: as Deleuze points out, this is in fact a natural tendency of striated space, and it takes active effort (e.g. by a capitalist world-system) to maintain the existing striation.