I agree that this all goes in cycles, and this is every sport not just swimming. I know the two blokes your talking about, I know the backstroker and IM'er your referring too as well I've been blowing their trumpets for the past few days on this board but i feel its irresponsible to mention their names as they are quite young.
I remember at a swim meet a few years ago I was maybe 15 and one of the blokes you referred to in your post (the one from Nunawading) was in my heat. Now I was a national swimmer at this stage and probably at the peak of my swimming career and he almost beat me and this other bloke I swam with, take into account that he was maybe 11 or 12 at the oldest. I remember thinking from that day he was going to be a star, not an arrogant kid either. He went something like 1:00 that day which is unbelievable for a 11 or 12 year old in 100 backstroke (that time would stand up with 17/18 year olds), In fact I'd say only a half dozen people have ever done that at that age anywhere.
Another guy you mentioned (Jayden Hadler) is a ripper bloke and an absolute gun, I hope he goes places.
Yeah I didn't mention the names for the same reason. You are right about Jayden. Nice kid. As is Kenny To as well, so I hope he comes along as well in the next few years.