I literally just finished the audible series about 30 minutes ago.
Here's another theory: Roland is an Agent of Ka. He helped his friends get back on track to where they were supposed to be within reality. It's why Susannah felt she needed to be wherever Jake and Eddie were.
When he gets to the end, he's now going back in time to start again, but this time with the Horn of Eld. The horn is a subtle "nudge" that Ka has provided him and serves as the butterfly beating it's wings and changing his trajectory every so slightly. Perhaps he will draw three new cards which are other souls who's trajectories also need to be corrected. So it's not only he that needs to reach the end of his destination, so do all people in all worlds.
The beam could represent the path many of use know we should be on, yet many of us drift and end up in unhappy lives. The fact that there are only two beams active, could mean that is the way Ka wants him to travel. Who's to say another pair of beams won't be active during his next trip?
Also remember that time moves at different paces in different worlds. Just because he goes back in time in his world mean that all worlds are in synchronization. For all we know, Jake, Susannah and Eddie are still moving forward within their world despite where the Gunslinger ended up.
So ultimately Roland getting to the top of the Dark Tower won't happen until the rest of existence has been corrected and everyone with in it, is on the correct "beam". Perhaps this is will be the eternal struggle...much like Sisyphus...except with a little more hope that some progress is being made.
The whole thing kind of reminds me of the film Donnie Darko...
Here's another theory: Roland is an Agent of Ka. He helped his friends get back on track to where they were supposed to be within reality. It's why Susannah felt she needed to be wherever Jake and Eddie were.
When he gets to the end, he's now going back in time to start again, but this time with the Horn of Eld. The horn is a subtle "nudge" that Ka has provided him and serves as the butterfly beating it's wings and changing his trajectory every so slightly. Perhaps he will draw three new cards which are other souls who's trajectories also need to be corrected. So it's not only he that needs to reach the end of his destination, so do all people in all worlds.
The beam could represent the path many of use know we should be on, yet many of us drift and end up in unhappy lives. The fact that there are only two beams active, could mean that is the way Ka wants him to travel. Who's to say another pair of beams won't be active during his next trip?
Also remember that time moves at different paces in different worlds. Just because he goes back in time in his world mean that all worlds are in synchronization. For all we know, Jake, Susannah and Eddie are still moving forward within their world despite where the Gunslinger ended up.
So ultimately Roland getting to the top of the Dark Tower won't happen until the rest of existence has been corrected and everyone with in it, is on the correct "beam". Perhaps this is will be the eternal struggle...much like Sisyphus...except with a little more hope that some progress is being made.
The whole thing kind of reminds me of the film Donnie Darko...