I honestly don't care if they ever add add-on support or not. If they do, more power to PC users. If not, not like we'd be losing anything in the process. The only people that would genuinely care if others can use add-ons are those that aren't really concerned about others being able to use add-ons. Sounds back-asswards, but here's the thing. When they do give such support you can guarantee that one of the first mods will be a parser. The 'hardcore raiders' will then make using it veritably mandatory, whether you're in a raid or just a random dungeon. Don't have it installed, they will make sure to point you out and make your time in their 'divine presence' as uncomfortable as possible, if not outright /votekick you. Is there merits to add-on support? Of course there is, but don't expect every player to be upstanding members of the community about it.