For beginners these faucets are really good to earn some satoshis. However now due to increase in the price of bicoin, many faucets are now providing much less satoshis after claim. So if the bitcoin price goes on increasing, eventually the concept of faucets is in danger.
Very true.
But if consider as business of faucets I think it will not stop.
Yes actually it totally depends on the future of bitcoins. Today among cryptocurrencies I think bitcoin has the most faucets. Faucets may continue with other coins in the case.