The problem as I see it is how often do people infringe at this point in the game? Very rarely will you see a passage of play at this point where a defending player does not slow down the ball in anyway shape or form. Thus stopping quick ball and try scoring opportunity. In turn this leads to the boring pick up and drive technique teams so often use instead of flinging it out to the backs.I dont think penalty try is the way to go, we dont want to scare the contest at a breakdown away from the game and having such a drastic consequence for what is a minor indescrestion could do that.
We shouldn't be worried the breakdown contest being not contested but the fact try's aren't being scored because of it.
Penalty try's will lead to more try's scored in open play instead of penalty kicks.