Online gambling has been solved like 20 years ago though... the majority of losing (-EV) gamblers are happy to pay a ~1% cut, they lose money anyhow.
Why would the fish (losing players) go through the trouble of moving to an ETH platform? They can barely start the computer most of the time... They go to pokerstars, 888, etc, because they saw it on tv.
Now, someone will say that ETH will be the technological backbone for these gambling companies and players won't really notice... I ask them, for the big gambling companies, what upside is there to decentralizing their backend? None, they want to retain full control. They will use a nice SQL database and proprietary software. After the DAO and hard fork debacles, they also know that not even the immutability of the ledger is save, the only property of a blockchain that might appeal to some serious company somewhere (besides maybe full anonymity)...
I wonder what you think about the bitcoin gambling industry. Does your statement apply to the bitcoin casinos and sportsbooks too? I ask because I am also wondering why there is not much traffic in them.