There's no way the register is going to disappear.
B, C and E (rip), P cat always (last few decades atleast) needed to registered so that'd never going to change.
The new system is at minimum going to cover those guns that previously needed registration.
I'm not holding my breath on full registration going away but at the moment there is still that chance, hence why so many people have waited until now.
Ith current scheme, as of next year buying ammo will be a activating event. So if this review says the system stays I think many people will be decide to just bite the bullet and register their stuff.
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