It does seem reasonable that there would be a cap, but I wonder how much cutting the pensions of a few thousand highly paid retirees will impact the budget.
[0] http://www.pers.ms.gov/Content/Supplemental/persfacts_figure...
$200k is a completely arbitrary assumption. And if your cost savings are off by an order of magnitude, it is basically insignificant, at <1% of the budget.
If you can wave a wand and reduce benefits, targeting only the top 2000 is probably not the most effective use of your magic.
How to approach this fairly is a whole other can of worms; there will almost inevitably be some unjust outcomes.
There are 2,032 people making over $100,000 per year. The sum of their pensions is $252,144,041.04 per year. If each were capped at $100,000 per year that would be $203,200,000 per year, so a potential savings of $48,944,041.04