I can't remember which episode this was in our radio scouts podcast, but I was playing devils advocate for the sake of the show. I actually think this is a good idea.
Though maybe an either/or scenario would be better.
When you're called up, you get FA after 6 years of service time or your age 27 season, whichever comes first. I guarantee the PA would never agree to a system that keeps an 18 or 19 year old under 1 team's control for possibly 9 seasons, a 20 year old for 8 seasons, etc before he gets to hit the open market, even if those last 2 or 3 seasons were still additional arbitration years with what should increasing salary. The key is that still only 1 team would have access to offer the deal to that player
The arbitration system sucks, the players hate it, the owners don't really like it either so adding potentially 3 more seasons of 1 team's control just isn't fair to those generational type talents that would be the most affected by it.
I would also get rid of super 2 completely, and lower the threshold of what counts as a year of service time to go with it, but I'm not sure how low to go. Can't really be less than 50% of the season