It has nothing to do with excuses, its technically no possible to just take everyone's SJCX tokens and convert them to the new token, unless you have a nice quantum computer to brute-force everyone's private key. That is for people that have SJCX on their wallets. Secondly, nor Storj or any commercial entity has the right or ability to force a exchange to change their policy or behavior. So if you want the SJCX token to not be traded anymore, ask poloniex and any other exchange still trading it. Storj Labs has been in contact with poloniex to handle the transition, this process is still ongoing.