"This means a much higher level of competition, and competition destroys margins."
This has wider implications on the ability to profit over the long run in a capitalist society. In open markets margins should tend to zero. It seems the only way to profit would be to have some edge in terms protected market (monopoly) or slight protected technical advantage for a short period. But once the protected advantages are gone margins should tend to zero. Therefore, this isn't just a problem of old media but of all markets.