That 25 Mbps is to ensure a steady stream at 20 Mbps. 20 Mbps for 2 hours is 18 GB, not 30 GB. As 4K becomes more the norm, the cost of delivering 4k service will be factored into everyone's bill. (My service provider allows up to 500 GB per month without complaint, which is almost 2 hours of 4k video per day.) In other words, if We the People use it, we'll get it.