I don't think you will have a problem - Fri and Sat are not popular with DVC members because of the added point cost. but getting a discount unless WDW does what it did this year might be tough.
Are you talking a regular discount or are you also including the member (dvc) discount on rooms? I would like to be able to atleast get our DVC member discount.
Also, is the only way to MK by boat from this resort?
Some members have complainted about not getting the discount. If the rooms you rent are from DVC then you get the member discount, if they are from CRO (due to member exchanges) then no you want get the member discount. But make sure you look on www.mousesavers.com
for the latest discounts.
there was a bus that would take you to the T/T station so you could go by monrail to the MK or Epcot. there is also a bus that goes directly to Epcot. but directly to the Mk there is only the boat. It is fun!!!