By the time I'm ready for my upgrade from my DX, I bet all phones will be on lock down.
I'm hoping that when the DX reaches its scheduled End of Life according to Verizon that they will unlock the bootloader. March 2011, crossing fingers!
http://www.droid-life.com/wp-content/uploads/2010/08/verizon-end-of-life-dates.png
Also, my next phone will certainly have an unlocked boot-loader. HTC ftw!