Not surprised tbh. Another Superman film was not on the cards in the near future. Now maybe both parties can reach an agreement later in the future but it is most likely that WB will recast and when they eventually do another team up it'll be with the new Batman and Superman actors.
A shame cause I liked Man of Steel quite a bit and was looking forward to seeing more of Cavill's evolution. BvS made some questionable decisions with his character I felt but still thought Cavill had a great Superman in him. Now it seems like we won't get that chance. Superman is a tough character to get right but it's mind-boggling how clueless WB seems to be on how to use Superman.