From various sources, MyEtherWallet (MEW) are not under development and maintenance any more. Even its founders has confirmed that they are switching to develop a new platform called mycrypto and encourage everybody to move there property to there.
But IMO, MEW or mycrypto is just a gateway to access your real wallet in the blockchain, so, both of them are still fine event MEW is not maintained anymore, right?
I just heard this information from you. I have not moved another competitor, I still stick with the Myetherwallet that I have. I am still confident with MEW. I will move if there are instructions or MEW is no longer safe.