Because we can now reach out to theoretically unlimited people at the same time, a small good idea with the right execution could changed your life forever. Google has officially announced that HTTPS will be used as a ranking factor for some global queries. This means there will be extra millions, if not billions, to be made per year online.
Question is: Who? The cake is there – are you good/smart/quick enough to grab a piece?
On a second note – it'd be interesting to calculate the extra power we would consume (and CO2 released!) when there's a major movement towards HTTPS.