@Frank Apisa,
Jee you're such a defeatist...
In any case, the main value of Bernie's candidacy is precisely that he is forcing a debate on the left on what the country needs, etc. His chances for nomination remain quite slim at the moment, so I don;t think you should be that worried just yet. IF and when he starts reaching out to beyond his natural electorate (white leftists) and starts scoring high among non-whites and among moderate democrats, you may have reasons to worry. We're not there yet.