With all considered, the marriage is an indication that my favorite Harry may become Prince of Whales, although it is not certain and not beyond his reach to become Henry X if his brother and his family so decide to put some vigor back into the royal house.
The Crown has been for the last several decades completely irrelevant to the health of the country and its people. If they do not assert their power very soon, it will result in the complete dissolution of their position and Buckingham Palace will be nothing but a crumbling relic.
Harry could only become Prince of Wales if his brother dies before their father. Even if William becomes King without yet having a son or daughter, Harry would only be Heir Presumptive - and only the Heir Apparent can be Prince of Wales.
If he does somehow become King - which is not absolutely impossible - he is at the moment, third in line - he would be Henry IX - the last Henry was still Henry VIII.
The Crown has been for the last several decades completely irrelevant to the health of the country and its people. If they do not assert their power very soon, it will result in the complete dissolution of their position and Buckingham Palace will be nothing but a crumbling relic.
The Crown is only supposed to assert its powers in particular situations of Constitutional crisis. None of these have arisen in recent years - if, for example, Gordon Brown, had decided not to resign after last years election, the Queen would have been compelled to act - but he did what he was supposed to do, so that was unnecessary. When the British system is functioning the way it is meant to, the Monarch is not meant to intervene.