If you're comparing against other major fiat currencies that's a pretty easy bet. The only way the dollar loses meaningfully, or fails completely, is if it is no longer the reserve currencies given priority over those other fiat currencies. This has to happen eventually but it seems pretty safe to say it won't happen within four years.
1000% yes. Not only is it going to survive, but it will probably beat out all other major fiat currencies over the next 4 years.