While there are some parallels, the differences between the decline of the modern West and the decline of the Roman Empire are qualitative and decisive.
1. The modern West rose with the industrial revolution, which is unprecedented in human history.
And the industrial revolution was a consequence of multiple and frequent 'technological' breakthroughs that caused a massive increase in productivity - such that the population of the world increased seven-fold; so we now have a world of more than seven billion people - six billion of whom are utterly dependent on continued technological innovation and expertise.
2. In the 400s AD Christianity was extremely vigorous and devout, dominated the affairs of the Empire, and had been growing exponentially for about 14 generations by the high reproductive success among its adherents as well as rapid conversion - that certainly does not apply to the world of 2014, where most of institutional Christianity is not just feeble and declining - but substantially anti-Christian in intent and effect.
3. Ancient Rome was corrupt, incompetent, faced by too many problems and so on... but the modern West is not merely corrupt and incompetent - but rather it is actively working to destroy itself.
Because of the apostasy of the elites; the modern Western ruling class hates itself, and labours strategically and deliberately to mislead, weaken, subvert and invert their societal values, especially to attack the remnants of real Christianity and Christian values (both at home and internationally) - and to support and favour enemies of Christianity and Christian values (both at home and internationally).
No - we are not recapitulating Rome - we are in new, unprecedented and uncharted territory. There have never been times like these, and there has never been a situation like this one.