Why would you be deprived of REM just because you're aware of your dreams? You're still in REM every single lucid moment. There are barely any negative effects at all, the good ones outweigh the bad ones tenfold. And sadly lucid dreaming is not like all other skills. If you learn how to ride a bicycle you will probably be able to do it for the rest of your life, however if you learn how to have frequent LD's, they will stop as soon as you stop paying attention to them.

So to answer your question: Yes, you will be able to stop. Now I'm sure some kind of study will show up later on because some asshole mass murderer claims his deeds was because of lucid dreaming, or if this thing gets too popular and the large entertainment companies starts loosing money because people can have fun on their own. I will never believe in those lies, the world is so full of them and I wouldn't let anyone take something as wonderful as this from me. If it's indeed dangerous according to future research, then it has minimal if not zero negative impact on a person's life.