For smaller firms, payroll taxes certainly have an impact on their choices about hiring. I think a lot of them would probably take a second look at whether they could afford to hire someone because now they would have to pay more for that person.
On CPP, the other thing I want to mention is that people who are self-employed pay both shares. When you increase CPP, you're not just increasing it for the employee. For that self-employed person, it's a double increase. They would be required to pay a substantial amount into a system where they want to use those funds to pay into something different than the CPP system.