I was listening to a podcast about a Danish murder investigation that included an interview by Danish police of a prisoner suspect in Finland in cooperation with the Finns. They went ahead with the interview without the lawyer present, which seemed normal to the Danes and wrong to their Finnish colleagues. It was one of the reasons why the content of the interview was inadmissible on court. That's the first thing I thought about regarding a lawyer opt-out.
As a fan of the Nordic Noir genre of crime shows, it's a great booster for extras. Whenever a person of interest has become an actual suspect, there will be a lawyer present in the show. In 99% of the cases it's an extra without any lines. So there appears to be a legal requirement to have a lawyer present or the interview cannot or should not proceed.
I think in general it is a hard thing to operate under a system where a lawyer must be present for any interview. There may not be enough lawyers to man every police interview with opt-out rules. They require remuneration as well. This may explain why the rules are so fishy. Case law is caught between not hanstringing police investigations with an opt-out system on the one hand and preventing overreach and abuse by the cops on the other.
Just as a thought experiment: if you required a lawyer being present for any interview at the station, apart from finding a way to pay these poor lawyers you'd also have to come up with a system where enough lawyers are readily available to sit in. Kind of like not all Parisian bakers can go on holiday at the same time. What if there aren't enough lawyers in your hamlet? Do we maybe need to create a hired function to satisfy the legal requirements? An office in the police station where a lawyer or a rotation of usual suspects of lawyers serve? Wouldn't this create a proximity where lawyers and cops become too chummy and possibly collude? The interests of the interviewee are best served by cops and lawyers hating each other's guts but working alongside they've become pals. I think there may be an unintended consequence that the course of justice gets more perverted by the opt-out systen than in the current fishy US system.
The scenario is a bit misleading. We didn't arrive at everything being wrapped in single-use plastic overnight so we cannot switch the other way that quickly either.
Perishable or hygienic reasons must allow for continued use for some products. But there are plenty of things that don't fall under that umbrella where waxed paper or single-use bamboo could make sense. You have correctly identified cost as an issue. The reason why everything is still wrapped in plastic like a corpse in Twin Peaks is it's cheaper. Plastic packaging is also more resistant to damage on the way to the consumer. So the calculations need to change. We need to raise the cost on plastic and lower it on other more quickly biodegradable items. That's a political decision, one that would be heavily lobbied against by the big boys in packaging. Yet another reason why overnight simply won't work.
The question about resources also hinges on the time frame. If the switch had to occur today, the answer is probably no. There aren't enough paper mills and bamboo nurseries in the world to meet demand. But there weren't a gazillion plastic factories from the start, they grew over time in numbers. One should also not forget that paper mills aren't without environmental impact. And neither would bamboo toothbrushes be. Also if we increase the amount of arable land to grow bamboo, are we decreasing land for food or animal feed? What are the effects of growing bamboo on the land without fellow periods? What fertilizer would be used? What toxic insect killer chemicals would need to be in use to guarantee sustainable levels of production? It's not like one option is the perfect solution to fix the problems with the other option.
A holistic aporoach would also have to include us consumers changing our behavior. That's definitely not happening overnight.