"Withstanding the forces" doesn't make sense to me. I don't see it as any more physically taxing than, say, a wizard casting magic would be.If they were to do a warlock today, it would likely be charisma primary with int/con as secondaries (or con primary with int/cha as secondaries). The idea of the con based warlock does make sense, in the "heavy cost of magic" sense, where you need to be tough to withstand the forces nearly beyond your control, etc. That is an approach that could really get explored more, with perhaps some future power source (shadow or elemental) being able to do a bit more with it.
To me it's a matter of a test of wills, of resting control of the forces with your willpower. In this case, I feel that is Charisma.
If anything, the Sorcerer is the one dealing with wild, surging energies that they have to contain inside of themselves, or whathaveyou, which would lend itself to Con.
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