There are almost no Summoners anymore because when SE decide to balance the Summoner around other dps jobs they ended up being slightly ahead of Bard in terms of damage. WoW has had the same problem with Warlocks since Cataclysm when the Warlocks disappeared and articles were written on why there was a sharp decline in the population of Warlocks for End Game. WoW developers couldn't figure out why the population of Warlock declined. Articles written by players stated their damage was on par with other dps but other dps performed better then the Warlocks and were easier to play.