If bitcoin climbs to $5000 then litecoin should have a good shot at it with the 50:1 ratio.
But do you think people would buy Bitcoins if they reached $5000?
Probably not the smaller folks dealing in whole bitcoins, but at that level it would be Wall St. and investors like the Bitcoin Investment Trust or proposed Winklevoss ETF.
Nothing preventing people from trading in micro-increments of btc if the price gets that high.