What Are the Various Approaches to Address Concerns About a Solo GP's Inability to Work on a Fund Due to Unforeseen Circumstances?

This is handled by LPAs by something called a Key Person Clause. You can see how the Cornerstone LPA handles this by searching the agreement for ‘Key Individuals’ and for ‘Limited Operations’ mode: But, basically, you can tell them that the fund will go into limited operations mode and then, the interests of the fund will likely be distributed to the limited partners based on the terms of the LPA.