Now, the House of Commons has made the House of Lords something that can be ignored, and now they also want to do away with the Queen.
I think it is dangerous to see the House of Commons gaining more and more power over the country, without any regulatory body being able to hold them in line. Basically, the person who leads the party that wins the general elections the moment the Queen's powers are stripped, is the person who creates, validates, appoints and signs the laws of the country. Is that the power you want to give to one single party? What if that body decides to stop holding elections?
A Head of State that holds office for more than one or two periods of a House isn't such a bad idea. Continuity is also important, especially considering the whims of (less than) half the general population every fout years.