Goldman Sachs released an info-graphic and report on the E-Sports market the other day. The info-graqhic is nice but the real meat is in the report.
They give some significant stats and growth based on current trends comparing it to other Pro sports leagues like NFL, MLB and NBA. One major point to take is that they are lumping in all gaming leagues (Overwatch, LOL, DOTA2) together. Now if you were really comparing apples to apples, you would just compare the Overwatch league to NFL for example. This report comes out as companies like Activision are starting to create official leagues for games with some serious sponsorship money. Money to help fund teams that provide a salary to their players. Starting to get real structure around it. This will have game companies looking at longevity for particular games of the competitive nature.
Currently they estimate the monthly audiance market at 167M moving to 276M by 2022 with media rights getting up to $3B by 2022.
Think it has the juice. Longevity of leagues i put into question as it will be dependent on the game dev and public to keep interest in a game. DOTA2 definitely has proven that it is possible.
The report is a long read but has some interesting figures.