From who exactly? Most of developed and developing world is facing demographic collapse over the next 50 years.
The US is the largest energy producer, one of the largest food producers, the most dominant military, has relatively stable demographics and has no trouble assimilating immigrants, etc.
And i predict that this time, at the last minute, the bill will pass again, like every other time. Unless the republicans truly believe that it's worth going down with the ship for.
Some would be fine letting the US default if their demands aren't met (e.g. Tea Party types).
Others not so much.
One difference this time is the amount of trouble the House Speaker had getting elected by his own party, and any closed door concessions related to that were very likely promises around budget and the debt ceiling.