No.
....will Catholicism's claim to be the ONLY true Christianity never end???
Up until the goat/sheep thingy...
no, because it is the truth and the truth is endless. There CANNOT POSSIBLY BE MORE THAN ONE, COMPLETE, TRUE Christian church.... there can be good, but incomplete ones, bad ones, blasphemous ones, but only 1 true and complete....if there were more than one, they would be exactly the same, therefore one.