I guess it really depends what incoming heal info people care about.. for example I only care about whether the unit in grid already has a heal being cast on them, so I can start a new cast on someone else if I am raid healing. Basically the current Grid functionally with HealComm-3.0 support I guess.
We try not to play whack-a-mole on bosses, assign paladins and druids as tank healers, assign shaman/coh priests to raid healing = Profit. Trash is usually whack-a-mole.
So on my grid frames a value for incoming heal amount is fairly useless. Yet other people like to see a value for incoming heals al la visual heal.
Sounds like overkill to me. Basically Grid just needs a library refresh (Ace3, Whatever the new version of Roster is, HealComm-3.0).
Both Ace3 and HealComm-3.0 are beta/alpha so I can't see it happening in the immediate future.
ReadyCheck and VoiceComm status should probably be part of the core modules, I'm sure someone will do it at some stage.
Now the ability to share layouts would be a nice feature, but you have to balance the amount of complexity it would add to the addon (potential for faults) vs the time saved. I mean it takes what 5min in an AV to configure Grid however you like it.