The problem with vocalsynth becoming mainstream is that the (to us, UTAU users) fascist copyright system of the mainstream is going to (and is already) plaguing us. Furthermore, the off-vocals for a lot of songs I want to cover are Piapro-locked. This is the reason why I release my songs under a Creative Commons license. Currently, the only safe bets are Mimirobo-P songs. If somebody has an original, throw it in here.