I haven't seen the numbers so what i am about is simply irresponsible, but i am quite confident: no. Not even close.
The six nations is watched by quite a few people outside of the nations taking part. I don't see a lot of people (other than immigrants from arg, nz, aus or rsa) watching the game. Time zones do not help. Not a bit.
NZ is rich (for the lack of a better word) but small.
Aus is rich but RU aint particularly big.
RSA is big but relatively poor.
So is Arg.
Try watching a 6N game in NYC. I guarantee you'll find a place, no problem. Try watching Aus vs Arg in NYC, New Delhi or Amsterdam.
TL/DR? No. Smaller audience, poorer audience.