The 1.9v saturation voltage is a maximum value and rated at 85 degrees Celsius ambient.
And the duty cycle graph is for 50 degrees Celsius.
Point taken, but these are the only temperatures given in the data sheet and lowering the temp it won't make that much difference to the saturation voltage. Also it's better mistakes are cleared up in the planning stage as it's cheaper to rectify. I have used similar devices in the past and they do get very hot when all outputs are running a fair current.
even if i put a heat dissipator on top of it it would drive the eight fans
It's not as easy as that, it all depends on how good a heat dissipater you could make, you are in uncharted waters. You could probably calculate how good it needs to be in reduction of the thermal resistance of case to ambient (measured in degrees centigrade per watt) but how would you know that your heat sink was that good.
or even if i run it at lower than 200mA (about 100mA)
Yes that would help but you are saying the fan has to take half the amount of power, that means get a smaller fan or run it at half the voltage. I guess it wouldn't turn at that.