I doubt it. The "conjuration" skills in ESO are pretty lackluster, even more so than Skyrim's. And Skyrim pretty much needed mods in order to get something that you could really rely on as a combat style, rather that just using them as decoys.

pure builds in pvp no,

pet builds in IC - dont think so - my pets are doing what ever they want thx to pathfinding issues :P

In PvE, the only pet I ever use is my Clannfear, he does a great job tanking for me and keeping enemies away while I burn them down; I cannot see a use for multiple pets though, especially when they do horrible damage which just prolongs the fights needlessly.

Now that I'm working a new Nightblade build, I'm having trouble getting used to not having my constant companion... I nicknamed him Scooby btw; a regular 'pet' doesn't work for me because they are just lazy and don't help fight.