Your frustration is felt by many people....
There is a flaw in the system that allows the many to be held at bay by the few....non-responsive people....
You are very right that the system needs to be honed and made into a better way of dealing with the profiles that belong to managers who are either no longer active or have just jumped ship....they cannot stay as they are (unmerged and with no active manager) forever.
There has to be some limit imposed on the availability to the original manager if they have not responded to any requests...
I still do not see why the 'pool' of profiles was abandoned....and a master list of those managers who have not been active seems, to me, still a good idea....claim them by coming out of hiding or lose the right to them...especially profiles over 'x' years time range....
Any other business has a policy for addressing abandoned property. Why not Geni...
Post the names of the managers with date signed up and last date active...as a notice that they should either sign in or claim themselves as active within -x- time frame or the profiles under their sole management will be re-assigned. No e-mail addresses, no physical addresses, no personal data...just the name they used to sign up etc...