many startup companies are valued in the billions when the banks come in and start buying shares/IPO'ing them
if they start a new block chain it will be for some other reason, the early founders having some chump change wont even enter their decision making process.
If Bitcoin truly took over the world economy, the founders' piece of it would no longer be chump change. There is ~$2 trillion in physical US bills (Benjamins etc.) out there, and only at most about 20 million BTC, so if Bitcoin was as widely used (as a base currency) as the US dollar is, then each BTC would be worth ~$100,000. So, if Satoshi (for example) holds something like 1 million BTC, then he becomes worth the equivalent of *100 BILLION* US dollars. Not that he doesn't deserve it.