No, it wont happen and come to think that fiat sportsbook had existed much more longer or the default way of gambling using up fiat when crypto sportsbook hadnt existed yet.
Crypto might give up something new to the market when it comes to decentralization but come to think that not all does have awareness about bitcoins or crypto existence.
If you do try to check out the number of people who had been using up these platforms then you can tell that there's still relevance on their existence.
It might be having some decreased in numbers but doesnt mean that it would just popped out and be gone just like that easily.