So can we go through list of companies that tried and failed in 1999 & see if its feasible now?
Used copies start at a penny.
A lot of people are still ordering physical products online for the first time. A lot of offices paying for a webapp for the first time. In a lot of senses 2012 is what 1999 expected 2002 to be.
If you grab a list of 100 failed 1999 companies, you have 100 things that people thought were going to be big in 2002. Worth exploring if you're looking for ideas.