As time passes mining is getting less and less profitable, don't know if there is a solution to stop this.
When mining become non-profitable for some not-so-efficient equipments, miners would unplug them and difficulty will go down.
Just like it did when all the cpu's turned off.... then again when all the gpu's turned off..... oh and then again when all the 130nm usb miners got turned off.
Yip big drop coming soon guys......