Comment by bsder
A lot of the hypotheses about Long <insert virus here> are about how well your body cleared the remnants. You can have a persistent reservoir of something for quite a long time until your body finally decides to clear it out.
One of the canonical examples of this are warts from HPV. There are documented cases of people having persistent infections until they "injured" a wart somehow, their body finally took notice, and then their body proceeded to completely clear all of them.
Modern medicine really does not deal with active viruses or their aftermath very well.
Perhaps this suggest that a treatment for long covid might be a new exposure to covid itself - or maybe a safer drug that mimics covid, like a vaccine or something analogous, that gives the benefit of "restarting" the immune response, but without the complications of real covid.