I'm not really bothered either way :? The present Queen has done a great job but Charles (the next in line) is generally unpopular and won't have the popular support that the Queen does now. If/when Charles becomes King, there could be a rise in republican opinions, so it maybe for the best to skip a generation and let William (who is popular) have a go.
I also think the high levels of contempt shown to politicians has increased popularity in the monarchy. When the Westminster expenses crises first happened, I heard many people saying the Queen should suspend parliament and take control. Not a bad idea but last time that happened, the monarch lost their head.