A whole lot of things are going to change when the Messiah of Israel comes again.
For example ... I hope people here realize that the US Constitution will be scrapped, too. The Bill of Rights will be thrown into the trashcan. The right to own and have guns will be eliminated. And all those Ron Paul types also better realize that there won’t be any of these illegal drugs allowed that they all seem to want to legalize for the good of society.
There will be NO DUE PROCESS, no rights to an attorney and no right to a jury trial!
There’s gonna be a whole lot of other things that will change on this earth when the Messiah of Israel rules with a “rod of iron”!
BUT ... in terms of the Third Temple being built and your reference in Revelation, from what I have read (there in the Bible and elsewhere) the indications to me are that the Dome of the Rock stays and the Third Temple is built to north or to the south of it. I think it’s to the north, in front of the Golden Gate.