I am not agreeing nor disagreeing Marty, but for me the only advantage would be ensuring you hit the fairways as distance is going to be somewhere within the range of a 3W and a hybrid.
With the top drivers in the game, they tend to be very forgiving so unless you miscalculate wind or miss the ding by a long way, you invariably still find the fairway. The amount of times I have said sh$t only to find the fairway after a missed ding - then say gees I like this driver!
This for me is an issue. So why use a driving iron when a driver or even a 3W will find the fairway, and be closer. Take Merion (I struggle on this track) I will often use a 3W from the tee - if I had a driving iron I would still use the 3W.
In real golf I am old school and still carry a 1 or 2 iron, which I often use from the tee (and sometimes 2I from the f/w). Yes I lose distance but I have a reasonable fairways in regulation stat. Using driver I find myself in trouble. The point is risk versus reward - and this game does not have any in the clubs department.
Add risk my having less forgiving drivers and probably much fast meters and by introducing more forgiving clubs (such as a driving iron) that will not offer the distance is the trade off. However it must be noted, the top players will probably still put the ball on a dime from 240 yards out.
Of course the first part will not happen, the game is way past that now, so why would WGT introduce a club that will be little or no advantage?