The problem with this plan is either of two things will happen.
1. Manufacturers will no longer include a charger with the phone, unless the phone has specific charging needs (like the iPad). You'll have to make sure you have a microUSB charger before you buy. I think many people will be upset and view this as gouging.
or
2. Manufactuers will continue to provide chargers in the box ... which does very little to reduce the amount of chargers manufacturered.
The only upside I see in this is that you could buy one car charger and use it for all phones, present and future. Although, when we upgraded our phones, I made sure both mine and my wife's phone used the same charging interface, just for that reason.
But different battery need different level of charging, will every phone in the EU have to have the same battery type, I am confused why this makes any sense at all. Are those people just bored and need something to do.