I wasn't suggesting a total revamp of the job. I'm fine with SMN being centered on DoT's with a pet. But as more summons get added to the game, one will eventually end up being the consensus DPS pet to use, while the others remain in our spellbooks collecting dust.
If summons instead are a spell that's added to our DPS rotation (ie. summoning Ifrit could be a Hellfire AOE attack similar to Flare, balanced by a reasonable cooldown and/or Aetherflow charge), then it really opens up how the job can develop further, while sticking to its roots. Other summons could then be added to provide utility, such as classics like Golem providing a shield to the party, or Fenrir casting Invisibility, etc. We would still be an Arcanist with our DoT's and tank/dps carbuncles at heart, but the SMN job would add to the class rather than just give it a coat of paint.