The problem with .us, it remains an extension for small businesses therefore not a very prestigious extension, we are far from other countries where the local extension is preferred over .com.
My first landrush was in .ca (in 2000) and after dabbling in ccTLDs for so long I have learned that each country is different.
I also believe .com is still much present in Canada alongside .ca because of the economic integration with the US, and in the US you need to be on .com to exist. When so many companies export goods to the US, operating on a .ca only would be a handicap.
Now that's interesting, perhaps the laggard .us is holding back .ca
k: