IMO no.
For all the gamblers around the world, only a part of them are doing online gambling; and only a small proportion of them are doing bitcoin gambling.
You are making a case for yes. The fact that so few people are bitcoin gambling makes it more likely that the market is saturated.
The market is bitcoiners. Its estimated there are less than 1 million people with 0.1 bitcoins or more, an ecosystem so small can not support a lot of operators. Yes if a new operator comes along and does absolutely everything right and has a huge marketing budget they can still succeed, but most of that would be taking players off other sites not new players to the market so that is still a saturated market. That all changes if bitcoin adoption skyrockets.