Spidey sense says heck no, but given they are also in the midst of healthcare overhauls I am not sure I'll be doing 20 for them anymore. I've got to do 10 no matter what, but given the way things are changing I am not sure if the next ten are worth it to get 50% of my base pay and so I think I might hedge my bets and opt into the new system.
Scenario 1: Opt into new plan, get 5% of base pay matched for years 2-20, plus 40% of base pay until I die.
Scenario 2: Opt out of new plan, get 50% of base if I do 20, nothing if I do 19.999.
If I hedged and took scenario 1 I'd get an additional 35k contributed into my TSP in todays dollars if I got out at 10, but I'd lose $13k a year in if I stuck around for retirement vs if I went with scenario 2.