I'm not quite sure what you mean by older FeralHeart players becoming "too old" to play anymore and "retiring", and what relation that may have to expanding the game and increasing the amount of players that can be supported in one map without lag spikes and whatnot. The Staff aren't just sitting around though, believe me, I'm sure they're always working their fluffy butts off and always will be on their free time.
People have recently been complaining a lot that the game is reaching it's downfall, when in fact- if anything, it's just the same as it was before- maybe it seems like not many players are in-game all the time, but timezones and times when people come online can vary; not everyone will be online at the same time as you might expect, we all have school and/or work to go to and other hobbies/activities to be doing in our spare time rather than gaming on FH 24/7.
The videogame players outside of the community who are dying to try out FeralHeart and see if they'll want to stay with us are by far more than welcome to do so when the registration is open, nothing is stopping them really. Patience is key and checking the Register section every 2 or so hours to see if it's opened up or not.
Again with the thought of people getting too old to play FeralHeart is not true, as anyone of any age (13+ though, I believe) can play the game and also leave when they no longer feel chemistry with the game; it's not a job and not something that you have to "retire" from at a certain age. Besides, the server can cope with quite a lot of users coming online at the same time and has done so in the past multiple times, especially when FeralHeart was first updated when we smashed our old record of how many users were online both on the forums and in-game.
I'm not quite certain what implications you're making with your idea and I'll edit this post if I reach a better understanding of your suggestions but as of now I don't think any accounts will need to be "put down" or given to the younger generations that join FeralHeart because other users are getting too old to play the game.