Dems/Repubs will happily play hot potato together forever, which they will if there is no third option, which there won't be if we maintain this perspective, and it will all continue dragging itself and all of us further and further right.
Solution is to abolish first-past-the-post first. Not to ignore mathematics and pretend reality does not exist.
Which neither a Dem or Repub will ever allow, and since you are convinced those are currently the only two options, it means they will remain the only two options indefinitely.
Might not want to look up what they were doing before that.