Disney won’t be getting rid of bussing anytime soon even if they want too.It is an interesting question, I would think as it will be run as basically an omni-mover - to be expecting that kind of pace. Depending on time of day, lines may be a bit heavy.
I am curious also, if the rumors are true that Disney wants to completely get away from Busing. If so, there will have to be some more different forms of transportation coming as well for where Monorail and Gondola traffic does not reach.