It can be combatted if Glastonbury choose to entirely hide your queue positioning, but I think this would cause a lot more frustration as people could miss their slot if they look away for a few minutes, or sit on the queue for hours and hours and never get through as their position was way beyond what was likely to have a chance anyway.
This system is de-facto a ballot anyway, it just requires you to log on at 8.55am and manually complete the purchase, but creates the opportunity to sell queue positions, meaning a ballot would actually be fairer and wouldn't allow tickets to be sold to the highest bidder.
The original system should have stuck, and I say that as someone with a 3/11 success rate.