The question I have is whether or not Disney is willing to kill their golden goose: DVD sales. If they are willing to cannibalize these sales, then their service is going to be very good. If not, then it probably won't have a competitive price.
And don't think they also don't have staggering content costs. ESPN paid $3.5B just for NFL and NBA rights alone[1].
Ultimately their share holders will decide how much their willing to subsidize the service.
1. https://www.si.com/extra-mustard/2017/06/26/espn-sports-righ...