When you summarize it, it all goes down to the "easy access" of the gambling sites in the world.
Cell phones/smart phones - If there is no application available for the gambling site, you can always use the browser of phone instead, if it won't work in mobile view then, you can use other browsers that have the feature of "desktop view". It's actually easy nowadays to create a solution for small problems like this.
Desktop/Laptops - According to ACS (American Community Survey) 89 percent of household today have a desktop or a laptop in their place. Internet connection is not a problem anymore because they are offering cheap prices for 10-25 mbps speed. Gambling sites doesn't need a super speed internet just to access it, most of them are text-based websites so loading a page won't be that long.
Marketing - We can now see celebrities endorsing the gambling sites. Even our heroes in the sport can now be paid to put the name of the gambling site in their shirts or jerseys or if they want more money, they can use their tongue and say the name of the site. Sponsorship. Every time we watch a sports event, any sport, you name it, we see their names being flashed on the screen.
According to the articles shared, sports betting will have the highest market gain in the next few years.
What do you think?
It's only gonna grow year over year at least in the US. As online sports gambling becomes legal in more and more states it will continue to grow. Its too easy just to open your phone or computer and drop in a bet. It's almost too easy. I do agree in the short term it will be bigger than it is now but it won't stop it will just keep growing.