That with $200 he can stake and win about $100000 daily something that you won't even struggle to get, they can't even pay someone at work monthly up to that amount. So if their is no more online gambling that means definitely there won't be no more gambling at all. So how will you cope in your country if eventually they put an end to online gambling?
If it's about making money and livelihood, I would say that is and was never meant to be taken as a source of income, so, who ever is depending on gambling a means of livelihood is supposed to go out there and get a job for him or herself and only gamble as a hobby, this way, you are never afraid of will happen if gambling is put to an end.
And on the other hand, @op, you only talked about online gambling. If online gambling is completely banned, offline gambling will still exist and I believe online gamblers will easily switch to gambling physically.
But again, all this are vain imagination, as long as the internet continue to exist, gambling, both online and offline will continue to exist.