Still saying peak America was 2008.
Better comms tech makes everything go faster, so America will decay faster than Rome did, but you're looking at about 150 years of decline. Ultimately America will hit the natural economic equilibrium of a banana republic. 

The Regime kicked the can; not unexpectedly, the debts that are being called are ones most Americans had no idea even existed. Although it was obvious they were in the habit of rolling debts over, the debts that showed up in the Official Press were all diversionary sideshows of little relevance.