Yes it is possible and even more possible now that rune can help with stam regen. The issue is DKs do provide more utility but again a Templar can do it
I have a tank of each class and like taking them through the newer HM dungeons and trials with our team to compare them to my regular DK tank that I use most often and see how they stack up patch after patch.
I do think Templars feel much better than they used to for tanking. But still come up a little short in some ways. Though most of my issues will be for challenging end-game content as they feel fine for more casual pledge dungeon runs and such.
For pull control: You will have to use Silver Shards from Fighters Guild to pull mobs when needed (or use a monster head two piece to do the job and still spend the magicka to taunt them so they attack you for the pull in). You also have to try to use either Time Stop (which needs really perfected timing on important uses like the Shalks spawn in Fang Lair) and it getting more expensive next patch. Or you have to use even more stamina and throw on a bow back bar and use bombard. Any of these options outside of using Swarm Mother will be very stamina intensive.
For Self Healing: You really have no great options here. Any of your heals will scale off of stam or magicka (whether you try and use vigor, breath of life, or something similar) so they won't hit as strong as a self heal from DK, Warden or Sorc. If you can get Breath to hit you and not have it go to someone else, it will hit a bit harder than NB's Dark Cloak self heal, but there is nothing worse than being in a large group like a trial and having to hit BoL four times, use all your magicka and finally get one 6K-ish heal out of all that waste. They really need a solid, health based self heal IMO.
For Shielding: Outside of DK (or warden vs. ranged attacks) they do have the best self shield for tanking as it scales off of health and gives a proc to the protection passive for a few seconds when you use it. Sometimes this is a better use of magicka, even when you are low health, than trying to heal yourself if you have a dependable healer that will be able to top you off soon.
For Debuffing: If you don't have anyone running Power of the Light, it's a decent debuff, but often a healer will run this in a trial. So often 'meta' groups will want a DK b/c they will offer engulfing flames to buff fire damage for the group (this is an overall balance issue IMO that ZoS should address as DKs also have about half a dozen other tools that make them go-to for tanking without giving them an additional group buff for the entire group on the most use general damage type in the game).
All-in-all, Viable? Sure. I use my templar tank as off tanking for vCR+ right now, but I'd swap to my DK to main just b/c it's more dependable IMO. If I were going to run vHMs of any of the new dungeons I'd also probably bring my DK for a dependable farm run, but if my group was willing to work with me, that's when I usually like to bring my other class tanks and put them through the ringer. If you are just going to mostly do pledges and normal or maybe non-hard mode trials even, I think a templar tank will feel fine to you.
This also depends on your group, if they are a very meta bunch, they are going to want you to run stuff like Ebon and Alkosh, which means you cannot run sets to make up for anything missing skill wise vs. DK. And it also means you won't offer engulfing flames to the group, so that can be an issue, but usually only if they are a very nit picky meta group as it really won't make a difference not having those things for more casual runs.
winterbornb14_ESO wrote: »Imperial Templar health tanking will be DEAD after the Nerf.
I will be taking a break since this patch will kill my main......good luck.