Will there ever be another tech company as big as Amazon, Apple, Facebook, Google, or Microsoft?
Chances that it will happen today are none. Chances that it will happen this year are none. Chances that it will happen in a decade are reasonable. Chances that it will happen in a century are almost certain.
Yes, technology evolves. Just look at the history of companies.
Microsoft and Apple in the 1970s, Google and Amazon in the 1990s, Facebook in the 2000s, Uber Snapchat Twitter (among many others) in the 2010s
So yes, technology evolves, new big companies will form in 2020s, has to be :)