Although I never played a summoner in 11, I have watched countless videos and demos of the class, and its considerably different from the summoner we have in 14. Honestly, about the only thing they seem to share is the name. I have to be honest and say that the Summoner from 11 looks so much more fun and worthy than what we have today.
I would love to see them just remove the summoner from arcanist, and give it its own base class, such as an elementalist or something. Just an idea, but the elementalist would summon elementals such as: fire, ice, earth, wind, etc...
Once you unlock the summoner class and defeat the required primal, you could combine its primal essence with the corresponding elemental to summon forth Primal Spirits aka Summons to fight for you in battle.
Leave the arcanist to upgrade into scholar, and make an elementalist upgrade into summoner. This is just my thoughts, I am hoping for a complete rework of the summoner class, what are your thoughts?