Hey Paul, we would usually mark an idea as accepted if it's planned. Right now we're not looking at adding WorldPay unless there is more demand for it. I see your idea for worldpay with just one vote and Richards idea asking for generic more gateways has more but not quite helpful as those votes don't count towards one specific gateway so hard to gauge what's being requested on that one.
If you've not already done so do link up with one of the existing gateways that is already integrated so this doesn't become a roadblock for you. If we end up adding WorldPay down the line at some point you could always switch over.