The rate of change in B2B marketing and marketing technology continues to accelerate, and 2020 promises to be no different. I asked the best subject matter experts I know, my colleagues at Spear Marketing Group, what trends they think will highlight the next 12 months in B2B demand generation. Here’s what they had to say:  “I fully expect to see continued buzz around AI, but I think the real heavy lifting next year is going to be around tech stack…