In fact, you have answered the question. Our members told us that with an increase to improve the CPP and the QPP, they will have trouble investing in their business, continuing to hire people, making investments, and so on.
Moreover, this will probably prevent them from making other investments in their employees' pension plans. They will be forced to share the cost of the CPP and QPP instead of perhaps offering a bonus to an employee that year. For his part, the employee might have preferred to reimburse his student loan or other important obligations. The effect of this is that it will eliminate certain choices that employees could have made.