Mhh, i would prefer no real rework of the summoner anymore and more expanding of what whe have now.

1) multiple pets:
Dont really see the advance of it. Except, of letting the carbunkle do anything again. But controlling 2 pets at the same time could probably be more problematic with the controlling. In addition should the the summoner have attacks that comes from himself to. So, that he didnt stand around and do nothing, like a Tamer in Digimon.

2) ST and AoE pet
Whe practicly had that before the rework. Ifrit was the ST pet and Garuda the aoe. In the praxis did most summoner keeped Ifrit and barely used Garuda (and no one used Titan, who was supposed to be a tank).
In addition is there no real difference to now and no real choice, if you still has to summon the others and can not summon the same pet multiple times.

What maybe could change is the duration, each summon stay. Ifrit is over to fast, to really feel him.

3) DoTs.
I dont understand the love for dots. But, i think the reason they removed most of them (esspecialy a dot based class, aside of Bard) was, that it messen up something by the bosses. When to many dots was used. In addition are dots to slow for normal fights.

In overall read most of the suggestion a change in the direction, how the summoner was before the rework. Only, with 2 pets instead of 1.
The summoner how he is now is even summoning his servants more often, as the old one. What create the image of a summoner to.