ZeniMax addressed the concerns in a forum post last night.
“[O]ne of the main concerns we want to address is the worry that we’re nerfing Templars in order to make the Warden a stronger healing class, particularly by nerfing Major Mending and giving it to Wardens. We’ve made it so all classes have to meet conditional requirements to gain Major Mending. DK’s need to have their damage shields up, Wardens have to heal low health targets, and Resto Staff users have to complete a fully charged heavy attack. It’s also worth noting that we’re planning on adjusting the Warden passive, Accelerated Growth, because it’s currently too easy to keep it active for long periods of time.
“If you’re worried that there’s no reason to play a Templar over a Warden, or any other class, keep in mind that Templars have a stronger single target burst heal that’s easier to aim (Rushed Ceremony), they have a faster healing spammable ability with Healing Ritual, and their Ultimate heal hits targets in a 28m radius instead of 8 meters. In addition, have also have a free heal with Repentance, can cleanse allies with the Cleansing Ritual synergy and can remove 5 effects from themselves. Rushed Ceremony is also still the strongest heal in ESO, so Templars still have a lot going for them.”
So maybe put down the shovels… for now… and read up on some Warden lore instead.