Concentrated, rather than dead. SC2 and AoE2 are the only games still running strong. SC2 seems quite alive. I play AoE2 competitively, and it's stronger than ever.

In terms of new games, yeah it's pretty dead. AoE4 looks cool, but I'd be pleasantly surprised if its near as fun to play competitively as AoE2. Wacky civ specific strategies make games more predictable, and 2d is more ergonomic than 3d.

I also will be pleasantly surprised if AOE4's online multi is anywhere close to AOE2's scene.

Definitely managing my expectations due to what I've seen graphically regarding the micro/non-intuitive unit design as well as potential balancing issues due to the vastly divergent civ play styles/age-up mechanics (e.g. Mongol nomad movement & the dynasty system).