"I think people have a vague sense that the television system is changing"

In this quote, Michael K. Powell is suggesting that there is a general understanding amongst people that the television market is going through substantial changes. This might refer to the rise of streaming services, the decrease of traditional cable tv, or the increasing use of technology in the seeing experience. Powell's use of the word "unclear" implies that while people may have a sense of these changes, they may not fully understand or have the ability to articulate them. This quote highlights the concept that the television landscape is continuously evolving which individuals understand this shift, even if they might not completely comprehend its effect.