Interesting concept but I'd like to see some evidence that they have structured their business in a way that the 100 year registrations don't vanish if WordPress goes bankrupt, e.g. a separate non-profit funded by a trust containing customer money.
Thats interesting.
I had booked domain named after my daughter who is 5 now and was thinking what would happen if I die before she turns to a age where she can start using it.
This wordpress solution might solve the renewal problem in that case as it is 10 years currently max.
Do we get pro-rated money back if Wordpress crashes itself out of existence sometime before 100 years from now?