Active players doesn't mean active clan. They haven't actually done anything at all since they were made except for 1 war, that hardly makes any of these an active clan.
I think the biggest problem is that i'm lacking information.
Maybe you're right about some clan(s) but I only know about EU Serider and trash, no idea about SIN though.
I don't count by clan wars because this generation only has 1 war and I don't want to count the clans "dead" because of that.
But EU Serider is very active in Discord and we're actually working on projects.
trash is very active in Discord and EU Serider is cooperating with them.
I don't know how much that means to you but to me these clans are active and the players are contributing to it. If you would daily look at GG2Stats, you would see trash, HPS and SIN players playing and scoring a lot. Sure, that's not what you said but to me it's different.
Maybe it would be called "dead" back when you and LORD and others clans were at the peak but at this moment i'm giving all of the 3 clans a chance. Summer is a good time for clan wars because a lot of ours will have free time during that season. Right now there are no clan wars but one is planned (maybe even two?) and that is EU SRD vs trash and EU SRD vs SIN. There, that's what I can say.
So yeah what i'm pretty much saying is that this is 2017 and it's not the "LORD wants to war everyone. don't accept our war request? gtfo" time anymore. At this time, clans of GG2 have to revive which is what we're trying to do.