His dedication is admorable & should be highly respected, how ever an organistion like the WTS should be, by policy, encoraging frail, ill, both physically & emotionally weak members to some sort of retirement from active field service & also provide a social network to replace the time previously spent in witnessing. Retirement from field service may mean other avenues of contact to preach e.g. letter writing, telephone, email, internet, or just sitting in the park talking to passersby. Expecting & demanding that it's members who are not physicly able to, is so wrong.
(Damn it all, they all should give it up).