It's still worth it by far. What you lost is your ability to chew up all of your lowest level spells for nice high-level summons. It's just a little better balanced of an archetype now. Now you have to lose higher levels slots.
Start with 16 INT, 16 CHA. That'll pretty much guarantee you 4 standard-action summons, mins/lvl per day if you chew up three of your 2nd-highest level slots every day. In return for those 3 slots, you get 4 of the best spell line in the game, in the highest slot available, one level early half the time.
The trade is definitely in your favor.
Your other option is Academae Graduate conjurer wizard for standard action summons. You have to make a fort save, and you're trading highest-level slots for highest-level summons...not quite as favorable a trade.