Merging the apps makes sense from a business standpoint — it will give them more opportunities to promote the subscriptions to users that only have one or the other.
But I suspect they will go beyond that — I’d take this as an early signal that Disney+ and Hulu’s existence as separate subscriptions isn’t long for this world. It seems inevitable that they’ll eventually be merged.
If you’re still paying for subscriptions like this, I’d suggest setting up a Plex server and spending the equivalent of a streaming subscription each month on purchased media — be it DVDs and Blu-rays to rip or digital downloads that you can strip the DRM from.
Start building up a library of content that you own to eventually opt out of this whole subscription nonsense.