I don't see this as a bad thing, but a good thing. It just needs some creative thinking. Gays will simply have to get used to doing business only with those willing to do business with them.
I'm not sure I understand what you mean. If they are operating a business (even if it is out of their home), have a business license, and advertise for public sale of goods or services - they still fall under public accommodation laws.
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It depends on what they advertise and where. They aren't going to have people streaming in and out of their home. They will have an outlet somewhere. If they advertise for wedding cakes, they have to make wedding cakes for same sex weddings. They aren't saying gays can't buy their chocolate chip cookies. No one can demand they bake them a wedding cake if they don't advertise that they make wedding cakes. You cannot walk into Dunken Donuts and demand a wedding cake. But if the girl behind the counter has been known to make a wedding cake a time or two and you ask very nicely, maybe she'll make one for you too. But she doesn't have to.
The answer is just too simple. Any Christian baker that doesn't want to make cakes for same sex weddings should immediately stop offering these as part of their bakery service. As the ruling in the Photographer's case said, they CAN use a disclaimer in their advertising saying that they cannot offer services to same sex couples because they have a religious objection.