The Telegraph has an utterly ridiculous article claiming that if the Act of Settlement (which excludes Roman Catholics from the British throne) were repealed, the Duke of Bavaria (genealogical heir of Charles I) would suddenly become King of England and Scotland. This all sounds very exciting, but has the minor drawback of being complete nonsense, as the article itself practically admits by the end. (It's irritating when journalists do this: imply something totally outlandish in the headline and/or opening sentences, and then at the end of the article finally have to concede that their sensational prediction probably will not actually amount to anything.) There is in fact no reason to believe that the repeal of the Act of Settlement (which I do not advocate) would have any retroactive effect whatsoever. It would merely open the door to future Roman Catholic monarchs or consorts from the present line. To declare that Roman Catholics are no longer to be excluded from the succession does not equal pretending that they were never excluded in the first place! By law, the Queen remains the Queen whether laws governing the succession (i.e., who comes after her) are changed or not.
I'm also somewhat perplexed by the claim that "there remains bitter feeling among many Catholics" at the deposition of the Stuarts. Really? Just how many British Catholics today go around tormented by bitterness at the events of 1688? Now there are plenty of historical events that I'm bitter about...1649, 1793, and 1918 come to mind, and I'm not a big fan of the so-called "Glorious Revolution" myself. But I don't think most people are like that.
No one would be happier than I for Duke Franz, by all accounts a charming and intelligent man, to be crowned King of Bavaria, reclaiming the rights of his Wittelsbach ancestors. But the British throne is already occupied--and quite satisfactorily, I think!