Doing away with grapple would be a huge shame. Usually when I attempt to grapple someone, I accept any die roll they feel is acceptable, from Belar's antagonize "DONT TOUCH ME YALL RUFFLE M'BEARD" to Magau's opposed grapple check, it's all about the rp, not the numbers.
For combat, I always thought it was a touch attack, then grapple check. And missing out on the ability to do so is a huge pity. Grappling is often the only way fighters/monks stop spellcasters aside from repeated knockdown.
Not to branch from this, but what's the roll for swallowing whole?
Touch attack->Grapple->Grapple?