An option should be added for lower-rep users to answer protected questions, while the answer will not yet be posted in the question. Instead, it will be placed in a queue until the question asker or a higher-rep user approves the answer. This way, people with low reputation with good information can still be helpful and answer the question.
This sounds like too much trouble, also considering that the user need only post a good answer elsewhere and just get one upvote. No need to make privileged users deal with yet another queue while the user can gain the rep first to show that he/she can post a capable answer. Plus, this will be especially bothersome in the event that spam gets put into this queue (which is one of the most common reasons a question gets protected).