Why Catholics Should Not Be Able to Be British Monarchs

I saw this in the London Times and it is worth reading. See Reform the monarchy? Let's wait for a century
The Act of Settlement 1701 discriminates against women and Catholics. But modernising it risks imperilling the Crown

He says in part:
There is quite a strong practical case for leaving the Act alone. The whole of the Commonwealth would have to agree any amendment. In some major Commonwealth countries the Queen is still head of state. In Australia, any amendment of the Act would lead inevitably to a further vote to make Australia a republic - perhaps already an inevitable outcome. In Canada there might be calls for independence for Quebec. The Canadian Government can well do without a Quebec crisis.
The UK would be affected as well; any reform of the Act would lead to new Scottish nationalist demands for complete independence, and perhaps also to new demands for a united Ireland. All of these are issues that will eventually have to be settled, but practical politicians might prefer to defer them............

do not find that the Act of Settlement is a burning issue with most Catholics. The relationship between the Catholic and Anglican Churches has never been friendlier. Few Catholics want to see the Church of England disestablished; none want to take over the cost of restoring the great cathedrals. Anything that weakens the Church of England weakens Christianity in England. Cardinal Cormac Murphy-O'Connor has said that the Act of Settlement is not high on his agenda.......................

Yet the issues are complex; a reform of the Act would invite the introduction of new issues, and potential damage might be done to the monarchy. Why add to the Queen's burdens? Many people, including many Catholics, will reflect that the Act of Settlement has done a good job in preserving the British monarchy through historic dangers. They feel great loyalty to the Queen. Perhaps the best thing to do would be to leave the Act as it is until the 22nd century............

I actually find this attitude a lot with very Orthodox UK Catholics on the internet.

Further I think the Monarchy with all the other troubles the UK is going throug might have to step in at some point if things get out of control.