You people are ridiculous.
Once they get rid of the terrain and interior, not only will they able to improve the lighting and add brick shadows, but it will allow room for other improvements. They would be able to improve vehicle collision and physics, an assortment of new bricks, numerous bugs and glitches, lots of things. Getting rid of interior and terrain will allow many more possibilities and will let them improve the game much more.
Have fun playing in the dark all alone with your terrain and interiors while everyone else enjoys Blockland's greater improvements.