Well, to play devil's advocate for a moment… if actuaries did agree they wouldn't publicise it as an increased expectation of health is would benefit them financially. If actuaries expected people to live less time they'd be keen to increase rates and advertise it. If they seriously expected people to stop dying then the estimated value of life insurance policies would drop to zero.

Personally, I think it's more than a little unlikely that we're the last generation to know death.