So far, the RBF feature shared by several bitcoin wallet, both bitcoin core and electrum as well as many other wallet allows senders to double-spending transaction.
Double spending unconfirmed transactions has always been possible, long before RBF was enabled, and once a transaction has a single confirmation its RBF status is largely irrelevant. The only way RBF enables fraud is if you find a merchant who understands very little about bitcoin but is also somehow running their own payment processor (and not using a hosted third party service) who then accepts zero confirmation transactions which are opted in to RBF.do you think this double spending can prevent bitcoin from being used by many as a secure mean of payment so that adoption rates slow down?
No. You either don't accept transactions without confirmations regardless of its RBF status, or you state that RBF must be disabled to allow zero confirmation transactions (up to a certain value you are willing to accept). If someone pays with RBF, then you require at least 1 confirmation. 
