My own arm chair theory is that the market leader's dominance of their environment causes an "economic hold" on the market as all the players maintain the status quo soas to recover their investment in whatever their product(s) happen to be (within the current leader's product supporting ecosystem.) This economic hold maintains as long as a competing option's "benefit" provides less economic opportunity for the entire market than the current market leader. After all, it's a collection of companies that make a market, and they will collectively protect their revenues then threatened.
