I have a couple things in mind, that IMO could improve this tool:
1) Instead of showing the next week episodes, show the next episodes. This would help in situations when there's 2-3-4 weeks gap between episodes, because the promos usually are being released right after the previous episode broadcasted, and it's easier to add them right on, rather than a week before the next episode.
2) Maybe consider to including Canadian/Australian/UK networks, at least the major ones.
3) Tighten the list by show type. Talk shows, reality, news and competition (game/sport) shows usually don't have a "Next on" promos (I could be wrong on this one, but rare seen it :). Maybe just stick to Scripted/Animation/Documentary.