Subscription video on demand revenues in the United States are predicted to rise from $16.7 billion in 2018 to $29.5 billion in 2023, as forecast by Digital TV Research. After China, the United Kingdom will remain the third most valuable market, with annual revenues forecast to double from $1.8 billion to $3.6 billion. The global total will rise from $37 billion to over $70 billion a year over five years. Some of that will come at the expense of traditional pay television but it is also displacing spending on physical formats. When you can select from a comprehensive online catalogue, the desire to collect discs diminishes.