Regarding Channel Divinity, it's only a healing ability now, but its real use is as a hook for function calls later, similar to the way you could pick up extra Channel Divinity effects in 4e and to how Turn/Rebuke Undead powered [Divine] feats in 3e. I'd be surprised if alternate Channel Divinity options don't show up in the PHB right off the bat.
If this happens, then Clerics should just get channel divinity, and drop spellcasting completely.

I see no reason why Clerics need two separate sets of resources, when we're having to fight tooth and nail to get a single resource for half the classes.