Veigar isn't completely dead... not yet.
His new q is actually refreshing. I feel the problem lies within the change of his trap. His defensive game-play is nearly gone now. Yes, it really limits his trapping ability offensively with the new animations and .75 second delay, but Veigar is now very susceptible to Katarina, Akali and Kassadin, or any champ with a quick closer. My feelings is that to make Veigar playable again Riot needs to fix the trap. Personally I would like it to be the way it was. No delay. I could see a change being that it has a little shorter range but that would be the limit. The delay really crippled him as a champion.