Let's look at an example in terms of real power. How does the rate of steel production in China affect the supply chains of global steel inputs? How does it compare to ours? How does the steel production industry feed into the shipbuilding industry? At what rate is China building surface combatants and submarines compared to the US? How many total does each country have? At what rate are we decommissioning them vs. building them? How will this affect which nation controls the global sea lanes of communication (SLOCs)?
USA is #3 in the world for steel production. I think we'll be fine and we can produce more if needed. Military use of steel is <5% of what is produced domestically.
I would agree that an economy too heavily weighted in services has the potential to be disastrous, and the same is true with being heavily dependent on commodities (see Venezuela and Russia). Services have potentially near limitless margins and high profitability relative to inputs, but you can't eat them or build a house with them. Whereas commodities are required for everything we build and use, but in terms of profitability they are at the mercy of world markets and the margins are slim.
As with everything, you can make a stronger argument for being strong with both.