Just because voter fraud isn't reported doesn't mean it doesn't happen.
If someone is paying attention during the election cycle there is no reason why s/he can't register prior to election day. And if you don't think the parties will round up people to vote on election day because they can register at the same time, you are in denial.
Personally, I could care less about the percentage of people who actually vote. My only concern is that those who vote understand and know what they are voting for. If this means fewer people participate in the voting process, so be it.