Hi John and Cedrik,
thank you both for the feedback. Your appreciation makes me happy. :-)
Talked to an old-school colleague about this and he says an ancestor of QNX was actually first with the "self healing driver" concept, tried to downplay Genode a little <g>. Well even if so, Genode is becoming a full fledged desktop OS (among several other things), so it will be "first" with restartable drivers from that perspective at least.
I'm not sure about the "first", but I think Minix 3 certainly deserves credit since their developers popularized self-healing as a desirable and attainable feature years ago.
Cheers Norman