You assume that every page need to have tracking cookies or that a websites would choose to have a blocking dialog if that was required in order to store and accessing information on users’ equipment. Even if we do those assumptions, its not a good result for anyone and there need to be some peace rather than war between the industry and politics, and making the concept of consent meaningless is a very risky move going forward.
Afaik you need it if you use Google Adwords. Not sure if Adwords could be changed in a compliant way.
I recently started out to implement the cookie header on my site, and discovered things are rather unclear. For example, couldn't Google somehow get global consent for all Google Ads?
There also doesn't seem to be a way to ask for consent and only trigger Google Ads if consent is given.
Maybe there are some things that Google could improve to alleviate the situation. But advertising probably also depends on at least a little bit of tracking.
If they (the politicians) want to outlaw online advertising, maybe they should just say so directly?