I have Poser7 and Zbrush2  I have paid for it. I  also would like to use them free of charge.
But,the cie and programmers need to eat also.
I will be happy to have Zbrush 3 for free but hope Pixologic find a way to have enough money to continue to develop it.
Orphan soft is not a good thing for users that need more functions and bugs free soft
Open source and contents  development are may be solutions for somes ,
But i thinks a dedicated people ( and money to paid them) to the soft development are the better assurance for version 3,4,5, 6 etc