Beginner Gardening: Help! Is this tomato blight? , 1 by CapeCodGardener

CapeCodGardener wrote:
My previously healthy tomato plants have, in the last week, developed extensive brown, crinkly leaves (moving up from the bottom to mid-plant by now) and even worse, soft brown disfiguring spots on the green tomatoes themselves. Nothing is really ripe yet (very wet and cool June & July.) They are several heirlooms (raised from seed) in the ground and next to each other and almost all have developed this problem, which looks like it's moving rapidly up towards the top of each plant.
My five tomatoes in Earth Boxes (away from the affected plants) are still fine. Only the EB Stupice is ripe yet, but these five seem to have only the usual minor yellowing of the leaves at the very bottom of the vine.
What is this, and what do I do now? Pull up and discard the affected vines? ;-(