I agree with OB on this one.
Some years ago, the iRB introduced offside lines at the tackle (an ELV). I agreed with it, and OB didn't. As it turns out, he was right, because while it seemed a good idea in the open field, it was a disaster near the goal-line, and in that respect, it is not unlike the scenario we are discussing here. Defenders found it impossible to prevent a try being scored if a player made a line break and was tackled near the goal-line; if he popped a pass to a following receiver, all the retiring opponents were offside and a PT would result if they tackled the receiver. It was dropped the following year.
There is another way to fix it; a very small change to the Law. Just apply the same conditions to 15.5 (c) that we do to 15.5 (d), so (changes in red)
[LAWS]LAW 15.5
(c) A tackled player may release the ball by putting it on the ground in any direction except forward provided this is done immediately.
Sanction: Penalty kick
(d) A tackled player may release the ball by pushing it along the ground in any direction except forward, provided this is done immediately.
Sanction: Penalty kick
[/LAWS]
and remove 15.5 (g) from the Law book
[LAWS](g) If a player is tackled near the goal line, that player may immediately reach out and ground
the ball on or over the goal line to score a try or make a touch down. [/LAWS]
There is no good reason for a tackled player to place the ball forward anywhere else in the FoP, so why do we allow them to do it near the goal line? If we remove the tackler's right to place the ball in a forward direction, the problem will disappear.
I can't see any possible "unintended consequences".