I suspect in the longer term this will just translate into people having to buy the chargers as extras rather than packaging them with the phones.
My worry is that this will hurt future innovation in charging and battery tech. Yes MicroUSB is at the forefront of technology now but what about in ten years time? If you set that as the standard that everything must be compatible with then you limit the potential for development, after all, no company will spend the billions of dollars required to develop the next leap forward in battery cell tech if the end result is a piece of kit that isn't compatible with mandatory charging method.
If you allow them to do so, industry standards evolve on their own without putting up barriers to further advancement. For instance look at the near universal adoption of DVD for games and movies, this happened organically over a relatively short space of time following the advent of DVD, however, when the time was right Blu-Ray was developed and is gradually superseding DVD. This kind of innovation comes about when one player in an industry (or a group thereof) break away from the pack to do something new. If what they do is successful you get the next big thing. Now if you chain everyone to a single standard then companies don't have the opportunity to break away and try something new.
Now I do accept this would have benefits, such as companies like Apple being reigned in a little in terms of how royally they are allowed to screw their customers. However, people aren't mindless, and governments shouldn't be obliged to protect people from themselves, anyone who buys an iPhone knows (or has had the opportunity to know) how Apple operate and if they still choose to buy a product deliberately designed to be incompatible with everything else that really is their look out. People should accept some responsibility and if they don't like how an organisation does business they shouldn't buy what they sell, simple. This is the reason I don't own a single Apple device.
People often talk of companies being anti-consumer and of their obligations to their customers. However, there is one simple fact that everyone overlooks, if no one brought a company's products it would very quickly go out of business. The people responsible for a company's success or failure, and by extension that of it's business model, are its customers.