I sure agree with you on that, we have awesome deadly technology and our ground units are still superb I imagine, but in a major war when we have no bench depth and our small numbers die in large volumes, we could be in real trouble.
I worry about the endurance of our military, what happens when they are getting worn down by lack of air support, lack of fuel and trucks and helicopters, front line troops going days without food getting through, and running out of ammunition, units being overrun, entire divisions being wiped out. Do these young people have the internal toughness to harden up and keep plodding into the mix losing ground, counterattacking, no sleep, bayonets even though they haven’t had a meal in two days, fighting with what they have, not what they had believed they would have always.
No they are not tough at all. We should coast on our reputation for a while. Hopefully our leaders are smart enough so we won't be seeking a major conflict anytime soon. But sometimes you have to fight (Civil War, WW2). It'll be interesting to see what happens by then. Our military was small during peacetime just before Pearl Harbor but we were able to mobilize relatively quickly.