The rewards dollars on the Disney Visa card expire within 5 years of the earn date. The rewards on the Rewards Redemption Card have no expiration date now. So unless someone has the Premier card and wants to use the points towards airfare, one could just periodically transfer what points they have from the Visa to the RRC to not accidentally lose them.
This actually reminds me I have some from the 5% bonus categories that I should offload to the RRC. Wasn't usually a problem when we did something Disney every couple years. But we've slowed down visits and we actually got close to an expiration date recently.