pet numbers havent been adjusted yet. So theres that.
Yes they are currently squishy on solo content for sure, but in group nothing prevent them from receiving a heal from the group healer. Most dont because they havent learn to heal and care for pets.
A pet shouldnt be rez in mid combat anyway.
In arena that will be a different story, will enemy team decide to use interrupt - cc just to stop you from reviving pet? or save it to actually chain cc to get a kill on a player. The later is most probable, while the first being an issue on low rating.
As for the rest, it really wont change much.