Online business is more likely to impact on the High street stores, the shopping experience in Boston with its lack of choice, high parking costs and poor road infrastructure is what will do for the town centre.
So perhaps those in power in the council should see this as an opportunity to in still life into the town, normally you hear people state I am going to Lincoln/Peterborough anywhere but Boston for shopping, and locals are fed up with the lack of choice, so bring it on.