First off this is a background/fluff discussion. We all know Eldar are very hopeful on the table top
The old eldar fluff was all about a dying race. Dwindling numbers, extinction, permanantly stalked by Slanesh, a growingnumber of dead craftworlds and more and more wraith costructs all leading to the great final battle, the Rhana Dandra wherethe Eldar are made extinct, but go down fighting
However in some of GWs newest content....the eldar have hope again.
Valedor and the Iyanden codex talk about the Flame of Asuryan, symbolising the fate of the eldar race, reigniting itself.
The Harlequin codex talks of the book of Cegorach opening, revealing how to trick slanesh into restoring the eldar to their prime and destroy she who thirsts at the same time. It talks of how the Rhana Dandra can bewon, not lost.
Is it just me or in this time of grim dark, have the eldar had their future made more bright and hopeful, with the fluff pointing towards success, not just a slow decline to extinction?