There is no such thing as future proof. Tech is evolving so fast that 5 years is unusually long for a piece of tech equipment to be considered current. Support for most devices is in the 2 to 5 year year range with 2 years being common. After 2 years, updates to support new services and protocols stop arriving. I have an internet radio that has been losing support for popular streaming services since it was less than two years old. Some equipment can be made to work for 5-10 years but it usually requires external devices to support newer features.
The best way to ensure upgradability is to buy separate components that have a wide variety of connection options. For A/V systems, that means purchasing separate amplifier and preamp components. They should support a wide variety of both analog and digital connections with a flexible array of inputs and outputs, including HDMI 2.1. Proprietary apps and connectors will become obsolete the fastest so they are not worth paying extra. Plan on using external boxes for apps and streaming in the long term, if not right away. The other option is to upgrade the main components every 2 to 5 years.
Avoid buying integrated systems as they often include components that are incompatible with other, separately purchased components. For example, integrated system speakers often don't work well with separately purchased amplifiers. It's best to assemble the system yourself using standard, separate components. I noticed that you have chosen a $999 price point for the entire system. That's not a bad price for a starter system but it's highly unlikely to provide exceptional scalability, upgradability or any protection from obsolescence. It will likely serve well for about 5 years. Beyond that is a bonus. I've never had anything but speakers last much more than 10 years with 5 to 10 years for electronics being more common. I occasionally hear about or see much older components but they are the exception and have usually been carefully repaired or restored.