It is impossible for sodium-ion batteries to reach the same energy density as the best lithium-ion batteries.

So lithium-ion batteries will never be replaced in smartphones or laptops by sodium-ion batteries.

But there are plenty of applications where the energy density of sodium-ion batteries is sufficient. Eventually sodium-ion batteries will be much cheaper and this is why they will replace lithium-ion batteries in all cheap cars and for most stationary energy storage (except when lower auto-discharge is desired).