I fear we have already had the golden age of enterprise. It's so complex these days to start any kind of business, especially one that is highly regulated, capital intensive, technologically advanced, international almost by definition, and subject to so many external factors as an airline.
The last two successful British airlines started from scratch were Virgin (1984) and EasyJet (1995) and both were started 40 and 30 years ago by men with an existing reputation and consequent access to financial support and thus could employ teams of people. Most airlines operating now were formed from other airlines, or by large corporations. As a consequence, consolidation is all that's likely to happen, as has happened in numerous other industries (car manufacture, aircraft manufacture, bus operation, shipping, etc).It's a sad reflection of the way the world works now that new entrants are likely to be few and far between.