A two parter -- would appreciate advice on either.

First, is there hope for my cherry tree? This last May some "gardeners" I hired for a weekend to help me transplant dug up my dwarf hybrid cherry tree (it has several types of cherries grafted together to be self-pollinating). Obviously that wasn't part of my plan. Within a few days most of the leaves started dropping, then dying and falling off. Now a few of the branches (20%?) have healthy green leaves while others are quite dead. There are also runners developing at trunk. So is most of the tree essentially dead but not know it yet zombie?) Are will other branches come back? If I should prune dead branches, how far back? I have very few sunny spots visible from our kitchen, and this one is the most primo of spots -- so if it isn't going to come back to full glory, I want to replace it.

Second, I have several 4-yr old myrica californica that apparently didn't appreciate last winter. Would have helped if I knocked snow off them... (next year). Some are leaning at crazy angles, have brown/dying branches, all are gangly... Can I cut these way back? Better to just replace?

Thanks!