adsH, I'd have to disagree with some of your analysis.
SeaPower was critical prior to this century. It was the means to project power, it was the means to deploy land forces etc etc...
OTOH, SeaPower has not been usurped, but complimented by precision munitions. The US, if necessary could still deliver sufficient ordnance by air and land to overwhelm a nations capacity to wage war at a force majeur level.
Sea Power is supplementary to that. You don't necessarily need a navy to blockade a port, you just strike the port and then use your air capacity to seek and destroy any assets that sally forth (this is an oversimplification so that we can get a broad concept in place)
The US has the largest commercial intercontinental fleet in the world, they have the most extensive, and they have the capacity to project their combat assets at will due to EW and refueling. No other nation has the overall flexibility and capacity to do that.
Look at China, it was able to deliver 26,000 troops into Tibet in days. Their uplift is in no way comparable to US logistics.
Force projection is now about a combined capability, not just a force element. Take away the USN and the US job is much harder - but it does not remove their capacity to visit irreperable harm on an enemy.
The US navy is never more than 10minutes aaway from being able to drop ordnance on an enemy, take them away, and that changes to 15mins at an intercontinental level.
Mahans definition of a blue water navy (and is still considered to be the proper definition) is of any country that has a permanent fleet footprint in all of the worlds 7 major oceans. There is only one country that has a full fleet presence under that definition. After that it becomes regional, France, the UK, then Russia. In real terms, Indias navy is stronger than Chinas at this point in time. Japans Navy is close on actual capability to France and the UK, if they decide to move ahead with an air defence vessel (ie a CV) then the balance will shift dramatically. The UK has probably the second most capable navy in the wolrd, but is a shahow of itself. In actual fact, the USN reserve fleet is the second largest navy in the world. In terms of numbers, the 3rd largest fleet in the world is the USN merchant fleet. Add them all up and no other navy comes even remotely close. Take them away, and the US can still outstrike any country left who wants to wage formal war on them. It;s not as easy - but it's do-able.