Apart from confounded's response, we are getting constantly better at factoring nunbers. Due to that the security margin of RSA has been dropping a lot faster than computer power has increased.

In fact, we don't even know whether RSA security is based on something provably hard.

I wasn’t at the talk, but I imagine this is may be related to beliefs around quantum computing gradually moving from ‘if’ to ‘when’, in the last few years.