Seenbutnotheard, in answer to your question I do feel conflicted, because I live 1.9km from Orleans Park and have a son in Year 3. If the link stays he will get in, and so will my younger son who is in Reception. If the link goes then neither of them will get in.
Having said that, I would still support the case for it to be dropped, because I think its unfair to children at non-linked primaries. Plus, even if it stayed, and both of my own boys got in, then my younger son's friends who didn't have a sibling link probably wouldn't get in, due to the expansions at St Mary's and Orleans.
Of course, nobody knows what will happen when Orleans converts to academy status. My best hope would be if they introduced an aptitude test for their maths specialism, as my eldest son would stand a good chance of that.
Now, I've got a question for you. Has your children's RC primary school sent out information in their newsletter about the Linked School Consultation? All schools have been notified of the consultation by the council, and should have passed the information on by now. I realise that you might not be interested in a local community school for your own children, but there will be others that are interested and they should know that the consultation is taking place.