There's a difference between Changing, and going Downhill, i'm sure we're not going downhill. As all the comments above stated, it's one of the most busy times of year. Holidays coming up, Getting into the groove of school, Work, ect. There's going to be a possibility of inactivity, and it'll be quite common, also keep in mind, many Users/Staff may have updated to 1.4, and are just waiting until the Servers update. Staff quitting also ties into inactivity, it's a busy time of year, We're doing a lot better then most Minecraft servers are. (When it comes to Staff).
By bad conditions, I could see were you came from with that. There's some possible adjustments with all the 'Anti Spam/Block/Lag' but this is going to happen, even if we have the option to change it. Before an Update, all plugins are going to go crazy, along with the Developer(s). The servers will 100% never crash and burn, as long as we stay as we're now. The server has such a big community, that it will never just die out. The servers will bring in new people everyday, and also take out people as well. This is just like any other server, just it's noticed more on MCSG, due to how large it is, and automation to it. Sorry if this was unclear, just woke up. "."