The Arcanist is such a fun class. The game play is highly enjoyable. Most of all, I love my carbuncle. He's such a cute guy that I don't want to him give up!

Basically, I can't see my Lalafell suddenly deciding to summon primals, especially since the story I've been following has me working with the Scions to defeat them.

If I remain an Arcanist without progressing into either Summoner or Scholar would I be able to do the later (50-60) content?

I'm talking as a DPS, not as a healer. If healing were required, I'd switch to White Mage.