I was there literally the first three days Epcot and DHS reopened, which is why although I can give my experiences, I give them with the caveat that things may have changed. It’s a very fluid situation. When I was there, the only time they ran buses for Epcot and DHS was if the Skyliner was down. Now that CBR is open, that would put more pressure on the Skyliner. If they find that the lines at the CBR station are getting too long to maintain social distancing then I would expect buses to return at some point. However, this is not especially helpful for you because that change could come before, during, or after your stay. We just don’t know at this point.
If you are completely anti-Skyliner (some people are) then I would reconsider your resort choice. You can stay at Pop and use ride share, stay at Pop and rent a car, stay at Pop but only go to parks with bus service, or change resorts to one with other transportation. It would be nice to have a crystal ball and know exactly what the situation will be when you get there, but we don’t. You are the only one who can decide what compromises you are willing to make, and how much extra expense you can afford.
For the record, I am hoping they bring the buses back sooner than later.