I would love to see an Open Source media center that supports streaming services. I wouldn't care if the services say "we only support 1080p for browsers / open source, anything more needs a locked-down device". (Perhaps the project could have some add-on you can buy that's a physical hardware dongle for doing 4k HDR and emitting HDCPed HDMI.) I already live with that for watching on my laptop. Just having watchable basic-resolution streaming would make it a one-stop-shop.

If streaming through a browser/open source / not the locked down app supported 1080p I would be a lot happier. My understanding from the last time i looked is that it actually only supports 720p