Yeah, immediate reaction after looking it over is that a -0.5 drop is... saner, though possibly skewed in the direction of underpowered. Look at it this way: with 5 people, -1 is 16 points for a team design. This is... brutal. -0.5 is 13.5 - a fair bit more balanced, in my estimate, but again... might be underpowered.
Here's a few teams I'm immediately pulling with the current design, presuming no negative points:
Deis2 (2.5), Geddoe (2.0), T.G. Cid (2.5), Kyogre (2.5), Eileen (1.5) - Replace Deis2 with Deis1 if you like her more. High speed massive damage rush from hell; the slowest is Cid until he gets Excalibur, then it's probably Geddoe which is sad. A boss with mass elemental walling and high HP to stop Cid is the best option, and even then the team is scary as hell.
Cecilia (3.0), Rika (3.0), Crowley (1.0), Geno (2.0), Fogel (2.0) - Two IDers (fast). Saner. Geno Boost. Crowley's magic. Hi-Prison. Fogel. Brutality, overall; not as good as the first team but still fierce as fire.
EDIT: Bartz (3.0), Wren (2.5), Eileen (1.5), Fogel (2.0), Hugo (2.0). The basic principle? Bartz uses Golem, Wren uses Barrier. Enemy offense suddenly, and literally, fails to exist.
EDIT 2: Okay. One other thing to mention? It might be easier to avoid the negative point issue if you just say "No revival works, but your max point cap when making the team is increased by x (3 or 4. 5's where it's at approximately right now).
This also has the advantage of letting you make a smaller, denser point value team and not lose the full effect of the sealstone, if you so desire.