Yes, but two major difficulties mitigate against its adoption. First, only a tiny number of people will actually devise, implement, and install their own short

Yes, but two major difficulties mitigate against its adoption. First, only a tiny number of people will actually devise, implement, and install their own shortener. Perhaps the major blogging platforms would adopt it, but that still leaves a large number of sites uncovered. Second, consumers of URL shorteners actually want unique short URLs so they can track clickthru. So even if a site self-hosts reversible personal short URLs, consumers will not adopt it. I have no alternative positive suggestion. It would be nice if URL shorteners called a webhook on the shortened domain.