You’re quite right! I’m focussing on mobile gambling since 2008 and it earns me a nice monthly income 
At first many webmasters didn’t see the potential of mobile, but awareness slowly grows as more and more operators offer mobile platforms too. At the moment there are over 30 mobile casinos and more than a dozen mobile bingo programs. The betting industry also went mobile; only mobile poker programs are still limited. But that’s a only matter of time imho.