The Bosnian adventure (which is but a pimple compared to the cancer of the Iraq adventure) was a mistake, but a mistake that didn't weaken our ability to tackle REAL enemies like North Korea and Iran.
I think we're far from helpless when it comes to the ability to project military might in other locations.
After all, we are now only a stone's throw from Iran and Syria, and certainly within missile and bomb range of N. Korea. I don't think we'd ever invade N. Korea in any event, or at least not until a long bombing campaign had attrited their ability to do much more than throw spears.
And the Bosnian "adventure", as you put it, had no bearing on any national interest of ours. In fact, it went entirely against our national interest in that we've been arming the Islamists there and helping wipe out the Christians. I really don't think it's the Christians who've been killing Americans around the globe for the last 30 years.