Yes, many companies will review all their options once they have plenty of capital, and make decisions based on what's best for their situation. For example, Twitter was reported to be switching from Ruby on Rails to PHP or Java amidst all their uptime troubles.
http://techcrunch.com/2008/05/01/twitter-said-to-be-abandoni...
My point is that choice of language is not what will likely stand in your way of becoming a monumental startup success. Yet people will insist on promoting language wars as if it will.