With such a large differance in roll stiffnesses front and rear, the car will lose grip at the front wheels as everyones said, you will be reducing the front wheels grip in braking cornering and accelerating, especially when braking into a corner and accelerating out.
It will take grip from the front wheels during cornering, giving grip to the rear (by the ratio of weight transfered between the front L&R wheels, compared to the rear L&R wheels (due to the comparitive roll stiffnesses of the front and rear)).
This extra grip is completly useless at the rear of the car, it cant effectivly be used, as the fronts will be losing grip at a much earlier stage, meaning less availiable grip before the car losses traction.
The higher roll stiffness at the front, will cause more weight transfer between the front two wheels when cornering (ask if you dont know, and want to understand why), making front inside wheelspin on corner exit more of a problem.
As others have said its not really dangerous, its easy and predictable to control, but it will require you to drive at a decently slower rate particulary when cornering forces are involved.
With wet roads, your car will need to be driven carefully and slowly and IMO would be more dangerous due to the reduction of useable grip your vechicle can make use of, which you may very well need in an emergancy.
If you want to fix this problem, and not rob your car of its performance & saftey, you will need to increase the rear roll stiffness, compared to the front. You can do this using a thicker rear sway bar, or by removing you existing front swaybar. Or altering both in any way to get a good ballance, and level of overall roll stiffness to suit what you want.
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