As a follow-up to my last post, I just read "How software is changing the architecture industry." I don't agree with its conclusions (survivorship bias) but I thought it was interesting that others are noticing the same trends, so I'd like to attempt a macro explanation:
This is what pure competition predicts of successful technological innovations. When first invented a new technology offers a comparative advantage to early adopters, but over time the technology's adoption becomes ubiquitous and comparative advantage disappears. The technological innovation becomes necessary just to compete in the industry. Economic profit approaches zero, and if all goes well normal profit remains.
Architecture is either in the early or late part of this cycle. My bet is that we're in the second part - that is, there isn't much if any additional profit to be made off of adopting BIM. Clients and contractors already know this capability is out there and they expect it. Lawyers even more so. The margin of acceptable error in drawings has been much reduced in recent years. Basically, if you're still using CAD you're in a John Deere world with a horse and plow.