I lost my QWERTY skills. (Score 1)

I made the switch to dvorak from qwerty a few months ago. I was suprised at how quickly I became proficient in dvorak with a little perserverance. Since I have stopped using qwerty except for occasions such as a search at the library I can no longer even touch type and go for hunt and peck. This happened in a *VERY* short period of time. So my answer to your question is no from my personal experience. As far as switching, it is fairly trivial to temporarily switch to the dvorak layout and then back to qwerty on Linux, windows and Mac OS. So there is probably little need to try to such mental gymnastics.