It took centuries for the Roman Republic to fall. At some point in time, they were past the point of no return without themselves even realizing it.
I think we are in that position now. We have been on the decline for more than a decade now, and have had several opportunities to correct or reverse course, but the wrong decision is made at every opportunity because it's far easier for powerful influential people to increase their power, wealth and status at the expense of everyone else and suffer no consequences for doing so than it is for them to sacrifice their own power, wealth, and status for the benefit of the collective. Are we past the point of no return? I'd say an argument could be made for either yes or no, but we are undeniably closer to the precipice than we have ever been as a nation since the Civil War (which never truly ended).