I think it's an idea for the future, they may return to the original ant-man as a period piece with a new actor as a kind-of reboot.
On the other hand what I'd like to see is a new series of Netflix mini-series following on from the 'Defenders' run focussing on the early years of a few established characters. They could probably get away with different casts for the younger characters in most cases and there are stories to be told. This could included 60s / 70s Pym as Ant-man, Captain America: The War Years, and an origin story for Hulk.