I believe the idea is that the buses will not be full and you won’t have to wait an hour because you didn’t fit on the bus, seeing as most guests at Pop now take the Skyliner. Considering the advantage of efficiency (much faster than a bus plus no standing) and the fact that the Skyliner is accessible for disabled passengers, the only bus passengers will be those who refuse to ride the Skyliner for whatever reason. If they get more guests than anticipated on the buses, they may expand bus service again.
Also, if you use the MDE app you can see when the next bus is scheduled to arrive at your resort. That won’t help you at the parks though.