Wouldn't the Eldar then have the whole webway collapsed? (and doom themselves in the process, I know...)
I very much doubt they have the ability to do that.
My own knowledge of the Eldar is a bit limited, but they can travel to other planets by other means than the Webway, right?
My understanding of the Webway is that it's like a...train system, of sorts. Webgates at particular planets or points of interest that a traveler can "stop" at, right?
Whereas normal warp travel is closer to a car (or maybe sky diving since you just land in the general location you're aiming at...most of the time). You can pick the spot you want. There's no real restrictions.
I assume that shutting the Webway would be a horrendous loss to the Eldar, but it would not spell their doom as they have other methods of travel, right?
said, the loss of the webway would likely be a fatal blow to the Eldar. The webway allows them almost-instantaneous pin-point access to millions of locations throughout the galaxy. Not only that, but it is a refuge for the majority of their species (Dark Eldar & Harlequins) - which is utilised to avoid the predations of She Who Thirsts. The webway wouldn't only remove their only reliable method of travel and communication, but also their only relatively safe refuge from the Dark Prince.
The only other travel alternative to the Eldar would be warp travel, which would be much more dangerous (perhaps even suicidal) for the Eldar - given their innate connection to Slaanesh and much higher warp presence.
NB: Mankind's dominance of the webway would also likely have hindered the Necron Dynasties as well, given that their only method of travel (outside of the torch-ships) is the webway. The Imperium's conquest of the webway would have gone a long way to ensure Imperial dominance of the galaxy for a long, long time.
Originally Posted by Malus Darkblade
(speaking of which, I wonder how the Orks/Tyranids manage to do it without incurring massive losses in their numbers. Though the latter probably can be said to lack souls).
The Tyranids don't utilise warp travel.