It's funny because the MX-1 silver edition has only just been released in Japan as a limited edition model.
The MX-1 has had a strange history in Japan. It was shown at CP+ 2013, but wasn't released until months after other countries. When it was, it was very low key, without any advertising at all and only the black model was available. I think it was in May 2013. It didn't make much of an impact.
But during this year, the camera has consistently been in the top ten of the compact camera sales ranking of Kakaku.com, the main price comparison website for electronics. I think this happened because the customer satisfaction rating on the same website was extremely high. Right now it's #3 in the sales ranking.
http://s.kakaku.com/camera/digital-camera/ranking_0050/
(I guess this link will be updated if you come to this thread at a later date)
So I think the chances of a successor are quite good.