It doesn't means much. Ok, let's say Eth surpass Btc in market cap, what do you expect?
Ripple is the 3rd, sometimes better than eth, but a coin coasts 25 cents at his better price .
Lot of people go with Eth, & for good reasons but you can't say, if Eth is no1, it should mean Eth is the best coin.
Eth is a good coin, people can afford it, & the last months were promising. ETC is also promising, even if It's the ancestor of ETH, he uses the same code & process.
Litecoin , I didn't believe because I'm focusing on technology, I change my mind. He's one of the best candidate to achieve what bitcoin can't do anymore. There is potential here.
We are at the beginning. It's not the best one who wins each time. Betamax was better than VHS (sorry, it's from 80s) but you may find examples easily.
So, this assumption is just symbolic. Go with eth, sure, 500 is a matter of weeks, but don't pay attention at this level of capitalization. Each coin with fundamentals beyond 200000 is valuable with unlimited potential
Cheers