I think they should do kind of what WoW did with this. Some players had mounts that carried around merchants, and blacksmiths who could be summoned before a raid fight or boss. They also had these repair bots people in engineering could build and summon anywhere in the game. That would certainly help if you're in a group that might be learning or struggling with an instance so instead of having to abandon they could summon a repair bot, and keep fighting on.