The problem is that doesn't address the problem. For example - the S 16th Right Turn onto Duff. There are 2 northbound lanes heading up to Duff, but only one is allowed to turn right. So, let's say everyone does utilize both lanes all the way up to Duff - everyone still has to merge in the last block or so and the same number of cars can still turn. Zipper merging doesn't get you to Hwy 30 faster because that is bottlenecked at Duff/16th interchange. Effectively you've made it so people can get out of the lots faster, but spend more time sitting on South 16th. And that's in the ideal scenario where everyone can perfectly handle the zipper merge. I think if that's going to happen there need to be explicit signs and people directing traffic to force it to happen.
In the real world - at Duff you have people in the left lane who need/want to turn left or go straight. Now they are bottled up behind all these people waiting to merge. You also have people getting more stressed because they are worried about whether or not someone will let them in, you have people getting road rage because the guy in front of them is too nice and let three people in, etc.
If I have to sit, I'd rather sit in the lot.