Yes, any skills that become obsolete will be automatically upgraded on your hotbar, so your final hotbar at 70, while it will play a lot differently, will use most of the skills (probably not medica) you have gathered thus far.
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You definitely want to keep Medica handy, if the party needs AOE healing and Medica II is already ticking it's your go-to way of topping people off if they aren't stacked for Cure III. I personally find Cure I becomes obsolete as soon as Cure II is available, the amount of HP it heals is negligible to waste a GCD on. Repose and Fluid Aura are also generally useless at higher levels.