I hold a fairly large amount of Noblecoin and I am wondering if I should transfer them to somehwere like Poloniex ready for the wallet switch as I understand that this means I can then transfer them back into the new wallet without having to worry about anything technical?
I appreciate the need to change to POS but from a user adoption point of view it is a right pain for the average person to worry about wallet switches and blockchains - if Noblecoin wants to become adopted and successful then from now on it needs to ensure that any user can download a wallet, buy some coins and then not worry about having to do anything technical to secure those coins in future - I wonder how many wallets will not get updated this time and how many potential future users will be lost.
There is no time limit, you can import you private key(s) even 5 years after the switch and your coins will be there waiting for you

It is just the exchange that have specific date when they switch between the old wallet and the new.