Well how about this?   Dump the "old, messy"  Bryce code in the trash, then take the modern Carrara code and mould a Bryce intrerface on top of it so it behaves just like Bryce, and call it Bryce 7. 
    And to have new, advanced features does not require a complex interface.  Example:  you can add a small button for snow, which opens a small window where you set the snow depth and snow drift, then press the 'make snow' button and voila!... every uncovered vertically facing polygon grows a layer of snow.  Now a simple feature like that would propel Bryce to fame and fortune once again.

It just seems like innovation, motivation or inspiration have all died. 

"An Example is worth Ten Thousand Words"