I know the feeling. They leave a big hole, but at least ponies are going to lovely new homes to be cherished.
If you're looking for a new project, I have a gorgeous 6 year old Fell gelding for sale if you'd be interested?
I was sold him as a ride and drive out of the field as repayment for a livery debt, but it turns out he is more than "green" when ridden: I suspect he has been used only as a lead-rein pony for kids to sit on, which he does well, but he doesn't really understand aids and sadly I don't really have the time or facilities to bring him on. I haven't tried driving him yet, but I've heard from more than one source that the chap who broke him to drive is very good. He's a stunning looker and has shown in hand as a youngster. I think he'd be a show-stopper in ridden classes!