.com domain names are under control of a single entity that can, and in fact regularly is, exercise it to confiscate domain names from their owners. Moreover these authority is also delegated to third parties.
Bitcoin is decentralized and cannot be confiscated bar agreement of negligence of the owner of the corresponding private key.
This is rather a key difference that sets them apart. But there is also all the other properties of money besides scarcity, such as fungibility, divisibility, portability, noncounterfeitability (sysadmins can easily counterfeit non https protected domains on LANs), durability (gotta pay for dotcoms to a central authority and their agents or they are gone). See here for example:
http://coin4.me/2012/05/properties-of-good-money-bitcoin/ .
Now back to basic claim of this thread
Bitcoins are more like domain names than any other asset
No, it is not. Bitcoin is more like gold than it is like .com domain names. If someone disagree, then this someone is gotta prove his point, for example by making comparison between bitcoin, gold and .coms on all properties of money.
The difference is that I can create BHUcoin with the exact same properties of bitcoin and nobody would accept it....just like no one cares about .biz domains. The adoption of the protocol is what is the key value driver.
Prove the point? Gold is physical. It has chemical properties. I can use it on my teeth or for bling. Gold doesn't merely exist electronically as a record. I'll bet in the year 2141, people are mining for gold. Gold is held by central banks. If the Internet died tomorrow and all electricity ceased to exist, gold would still exist. Gold existed before the Internet and written language. If human beings ceased to exist, gold would still exist. Gold might exist currently on Mars or Jupiter.