Not necessarily. Just because of streaming services, it doesn't necessarily mean that the production values should degrade significantly, particularly since there's already been successes on services like Netflix, which is already proving to be an excellent challenger to the dominance of the Big 5 and pre streaming-era mini majors. In fact, one can argue that Netflix is already becoming a mini major in itself.
Netflix is also substantially more expensive than Disney and many other streaming services Sure you can get it for $9 but that’s the non-HD version. I’m sure the majority fall onto the $14 HD plan or the $18 4K plan.