I think the main idea behind the old track was that it should fit the rest of the park audio. It was created at a time where the park was trying to create a continual theme and tune between all their tracks. Essentially, every new track had to contain at least an exert from Towers Street. Cloud Cuckoo Land, Dark Forest, Splash Landings lobby, and the Monorail station all did this.
I think the old audio worked well with the Resort Overview video. It was a fun and lively track which was meant to be timed to the events of the film (Even if some of the mixing was very butchered
However, it seems this year to tie in with the new brand the park are pushing ITHOMK as audio, rather than Towers Street.
The old audio used to play from the video, this was how they kept the timings, so when the video left so did the audio. However, I wonder if the park have done the same with the new one. Correct me if I'm wrong, but both the audio and video have been copied straight from the Resort Box Office. So no doubt one came with the other.
This is what's a bit annoying. Yes, the old audio was essentially another track remixed, but at least it was unique in it's own rights. The new audio though is near enough a direct copy. Is this what the park are going to be doing now to no doubt keep costs low? Recycle one track across whole areas? They've already practically done it with Dark Forest and Cloud Cuckoo Land. What happened to making each attraction unique and different slightly? It's a great shame, as Towers have created some first rate audio over the years.
Also, I'd imagine one of the main reasons the old video left is that the park either couldn't be bothered, or wouldn't pay for a new one to be filmed, or the old one updated. I think one of the main giveaways it was outdated aside from the lack of showing new attractions was the little details, like Towers Street having a red towers, or Spinball being turquoise. It is a shame they wouldn't experiment with mixing some new clips in and taking out the old, as there is some fantastic footage in there and it's a shame to see it go to waste.