I think there is good reason to be optimistic about Lawson's three-point shooting. He shot threes very well at the beginning of his career (over 40 percent, though with limited number of shots), and then once he became more of the focal point of Denver's offense, he shot more three pointers for a far worse percentage. I'm betting that a lot of those additional three pointers were of the "shot clock is running down, time to jack it" variety. The stats on NBA Reference.Com provide some support for that assumption. In his first two years in the league (when he shot the three ball well), 20-25 percent of his three-point shots were from the corners; last year less than 10 percent of his three-point shots were from the corners. It seems reasonable to predict that working with Harden he is going to get a lot of wide-open spot up threes, and that he's going to hit more than 40 percent of those. And teams will have to be very careful about their run outs since Lawson is so proficient in driving to the rim.
The Rocket offense is going to be very, very difficult to stop.