Positive+Negative
1) Since all iPhones and iPods and iPads use the same 30-pin connector, the EU will most likely let Apple release an adapter. Other companies just don't have enough customers to say that one of their connectors are standard. Apple's 30 pin is so widespread that it has practically become a standard, as evidenced by the massive accessory industry that has cropped up just for the iPhone's dock connector.
2) For most of the EU's citizens, this will mean the end of finding the right kind of dock connector. However, I don't see that all adapters will be compatible with all phones, as voltage requirements are different. For example, certain iPhone wall chargers don't work with the iPad because they don't provide enough power.
3) Won't this mean a huge redesign for some companies? Some, like Samsung, use 5 or so dock designs and replacing them all with one standard design may increase the price of the phone considerably.
4) From my experiences, Micro-USB is an unreliable, buggy, and slow method of data transfer. I have had multiple smartphones get bricked during a firmware update because static electricity screwed with the connector. Also, phones are prone to falling off their USB connectors which become loose after a few months. Apple's 30-pin design seems to be very stable and resistant to environmental change.
5) Why does it seem as though Europe/the rest of the world is constantly trying to cram standards and treaties down our throats?