Agreed that third parties are possible, though it is still worth noting that a third party win would almost certainly result in an existing party being replaced

Agreed that third parties are possible, though it is still worth noting that a third party win would almost certainly result in an existing party being replaced for a different two party system. The parties in the US have changed around something like 5 or 6 times. In the last 2 or 3 changes the party names didn't change but the parties did fundamentally change. After each shakeup, we've ended up with a two party system that's structurally unworkable for independents to win at the highest level.