Good points, indeed all measures have some unintended consequences.
Thanks, I happen to know more about running gaming tournaments than about moving chess pieces around the board.
to have [streaks] is even worse, as it adds a huge element of luck,
Adding luck is the sole purpose of Arena.
Why should someone get 2 points for free, if he had only a lucky streak of lower ranked opponents?
Why not disallowing Berserk under the some logic?
So in future I plan 2 separate skill leagues
This is terrible idea. I assume the lower bracket still has cash prizes, begging strong players to maintain low-ranked alts. Weak players have still no shot at winning prizes meeting tough opposition - just on different accounts - crushing their confidence, ratings and plain out discouraging attendance in the long term. I would rather have it at no prizes.
BTW, giving a 1200 player a rare opportunity to play a titled opposition is just another feature (selling point if you wish) of Arenas. You do not even get that in the first round of a Swiss with all the bullshit bloodbath-seeding (you need to be in the middle of the field to get the star opponent in either first or second round).
Berserk allows more fun by handicapping uneven games. Streaks allow more fun by giving more people a shot at winning the tournament. If this series is supposed to find the champion rather than attracting large fields, you should - I repeat - avoid the Arena format in the first place.