Semi-protection seems to be a great success in many cases. I think that it should be extended, but carefully, in a couple of key ways.
1. It seems that some very high profile articles like [[George W. Bush]] are destined to be semi-protected all the time or nearly all the time. I support continued occassional experimention by anyone who wants to take the responsibility of guarding it, but it seems likely to me that we will keep such articles semi-protected almost continuously.
If that is true, then the template at the time is misleading and scary and distracting to readers. I propose that we eliminate the requirement that semi-protected articles have to announce themselves as such to the general public. They can be categorized as necessary, of course, so that editors who take an interest in making sure things are not excessively semi-protected can do so, but there seems to me to be little benefit in announcing it to the entire world in such a confusing fashion.
2. A great many minor bios of slightly well known but controversial individuals are subject to POV pushing trolling, including vandalism, and it seems likely that in such cases, not enough people have these on their personal watchlists to police them as well as we would like. Semi-protection would at least eliminate the drive-by nonsense that we see so often.
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The basic concept here is that semi-protection has proven to be a valuable tool, with very broad community support, which gives good editors more time to deal with serious issues because there is less random vandalism. Because the threshold to editing is still quite low for anyone who seriously wants to join the dialogue in an adult, NPOV, responsible manner, I do not find any reason to hold back on some extended use of it.
Be glad, if my proposal worries you, that I am not proposing that we automatically semi-protect all living bios. :)