Dark eldar troops are some of the most skilled troops avaliable in the entire world of 40k, but they are as fragile as any non-enhanced humanoid. So to compensate, most succesful DE players get around this by maximizing our speed, using plenty of raiders and web way portals, but you could certainly also get around it by using high numbers of warriors.
And I do think that yo should start DE right away. Our codex is not in bad shape, compared to the other non-marine codecies out there (even the 4th ed. ones), and it is VERY unlikely that GW will make the next DE codex better. If anything, my guess is that DE will be 'streamlined' as GW calls it, which means that everything cool and unique will be removed from the codex to avoid confusion, and the army will be dumbed down (made easier to use) to appeal more to new players.