I haven't heard anyone talking of building a new one. They want to refurbish the interior, the roof, and the minarets that collapsed.
If you want to leave it "as is" ... I guess you are also against the maintenance to prevent the Jefferson Monument from shifting and collapsing? Everything should be left to fall apart, so it all looks like all the old ruins around the world.
The majority of Notre Dame is fine. It's mostly the main spire that was damaged. There is no "new shiny" one being built, they're just repairing the parts that are damaged or structurally unsafe.