Carrydown isn't really the problem today, it's oil depletion? The little bit of oil the balls are depositing past the end of the pattern. Isn't really enough to affect the motion of today's balls.
When the balls start backing off down lane, it's because of the additional friction from the depletion of oil. It causes the ball to standup ( hook sooner), Lose rotation and have a weaker backend reaction.
So them not wiping thier balls isn't going to be a issue or making carrydown worse.
Heres a good article about it.
http://bowlingknowledge.info/images/..._slowinski.pdf
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