If we're able to defend on the second and subsequent tackles, I'm sure we'll be able to do it on the first as well.
I think the issue is more about field position. We have been very effective the last two seasons kicking deep, chasing hard, and then holding down on the first or second tackle, and then with our line speed keeping the opposition in their own end (even if we give away a six again or even two, we only have to defend for 6 or 7 tackles). By the time the opposition completes the set they haven't got out of their own end. When they kick, Edwards or To'o then starts off our set on our 30 m line.
The problem with kicks for touch is that they allow the opposition to get out of their own end, which makes our ability to control field position so much more difficult.
It should go some way to reducing blow outs, but we won't see the sort of defensive records that we have seen the past two seasons (either from Penrith or the Storm) once a penalty allows a team to gain 30 - 40 m with a kick from touch.