I would quite like to see an experiment with a distance only penalty for OB, so if you hit your tee shot out of bounds on a hole, you're playing two from the tee, not three. I guess this wouldn't achieve the pace of play goals discussed above, but I think it might allow the return of the strategic use of OB in design - as per some of the great old holes like the Dowie at Hoylake. Though I guess also in this litigious age deliberately encouraging people to flirt with boundary lines would be fraught with legal difficulties...