I’m not sure tracking can be solved well; any information about it is deliberately vague, because it forms your api contract, and you want to swap out the rules from under the user’s feet, because that data is just so damn useful that it can really be sold off anywhere. I find it difficult to believe marketing can get trust out of someone who doesn’t: at best, it can continue as it currently does, keeping people who don’t think about it from thinking/caring/distrust about it. The whole thing is so opaque, unregulated and nonverifiable that its not even clear that you won’t just flat out lie about how tracking data is being used / sold to. Or even what exactly is being tracked.
I’m pretty sure if you don’t trust tracking, you don’t trust any of its various forms. It might be too much effort to avoid, or you don’t care enough, or don’t really expect anything to go wrong for you from it (the average person leads an average life; there really is nothing to hide, at least from most current web-tracking) but I think the trust gets lost in total.
Also, yes, you could argue that analytics for e.g. A/B tests are actually "improving the website/service". Yet I'd still prefer to opt out of them, because those A/B tests usually encourage making the software more addictive (erm, "engaging") and less useful ("only single-digit-% of users use this feature, so let's drop it"). I don't trust the motivations of those companies, so I don't believe they'll use A/B tests for my benefit as a user/customer.
I bet people would do that if you frame it right. E.g. "help us improve our website! You will get to see our new website first and we will see from you interaction how we can improve. It would be a great service to us."
Marketings job is to sell this - they sell all kind of things why not sell tracking