I don't think Primedice will change their jackpot model. The prize will remain attractive, but it is hard to attain. The number of bets has reached almost 110 billion at Primedice, but no one has claimed anything from the jackpot prize yet. Perhaps, many bettors has got the number with required bet amount but they didn't check their bets. I believe, we would have seen some jackpot winners if the jackpot system was automated.
I don't think either. I am not sure when I have seen the last update from the Primedice team. I don't play there anymore so, I don't know if they have released a new update or not. I believe even their developers cannot remember when the last time they worked for Primedice was. This site is like abandoned by the Stake team. But Still, this is one of the popular and old casinos where people love to play. Still, it's bigger than many other casino platforms.