I personally doubt there will be an economic collapse.
It's just math.
When obligations are growing exponentially faster than the growth rate of economic output then it's obvious that eventually the obligations will eventually require more than 100% of economic output to fund (impossible).
Predicting exactly where the breaking point comes isn't possible with any precision but I will confidently state that transfer payments will never reach, let alone exceed, 100% of economic output. Before that happens something is going to give.
One man's economic collapse is another man's slavery. It's all good.