Personally, i feel that hide's role in x japan's MUSIC COMPOSITION issin't really replacable. If you look at Taiji, after he left, the sound of the bass changed in x japan songs. When Taiji was still playing, there were emphasis on the bass and it gives X songs a good heavy effect. When it was changed to Heath, X songs changed; it seems that the bass was given a lesser role. Not forgetting too that Heath and Taiji had different music arrangement preferences; Taiji's bass compositions are more agressive and rock while Heath is more reserved and slightly more mellow.
I watched a video of yoshiki's, the new beginning i think, he mentioned that hide was in charge of the guitar's composition in x songs. So with that i thought its quite certain that the new x songs would be different. The replacement definitely will not have the exact same musical senses as hide and so when he composes the guitar parts, its definitely going to be very different. I just hope that whoever is filling in for hide, is as good as him if not better.
As a selfish hide fan though, if there arent going to be new songs, i hope there won't be any replacement; a playback is a good idea.
sorry if this post issin't supposed to be in this topic, there are so many topics debating whether hide is replacable that i got confused and decided to comment in the lastest one. ^^