INtel is not making motherboards for consumers anymore. They got out the business.
Now that motley crue of MB makers are in to make money. TB is too expensive. USB is very cheap.
Intel can make all the standards they want. If people don't use it,????
Microsoft didn't support it from the jump, and pushed USB.
So I will answer this question very clearly.
Is Thunderbolt Ever Going to Take Off for Windows Machines? No.
And the reasons have been stated.