Well considering WoW, 17 year old game, has speech bubbles and has no issues with it.. I dont see why wouldnt we get some. I really miss this feature from it. Way easier to figure out who said what and where. For example there are lot of people who just go "stack on me" in party but that would sometimes require watching chat while doing combat and then figuring who tf is where. Small issues I guess now with stack marker but eeh - it would add more liveliness to cities too.

Example of ESO

However it would need options how far you see what. Some holidays in WoW get really messy when 20 people speak at same time :P