It's only a trial; so if it doesn't work - it gets scrapped.
Last season though, we all saw how exciting games suddenly became when teams needed not only to win, but to win by a given margin of points. In fact, the last day of the last Six Nations was probably the most exciting days rugby I've ever seen.
Yes I do understand what a trial is. The point is will it work? Does history support the idea? How did 3 to 4 and 4 to 5 points for a try improve try scoring stats? How did reducing the value of the DG from 4 points to 3 "improve" the game by cutting down on DG attempts etc?
To your second point I fail to see its relevence. Ifyou need to score 30 points to win the league, this actually makes it easier. You only need 5 and not 6 tries!
Also the manufactured 6N finish was crazy. even Sky insist that the "deciding day games kick off together to aviod the lottery of who plays last gets the advantage. England benefited this time around. A few years ago it was Wales. Daft system even if it produced "excitement" at the end. Sort is supposed to be played on a level playing field