"I imagine I'll be happy with the 430mm stays for years to come."
Exactly my sentiments when I put longer stays on my bike, but now after riding the long 47cm stays I am thinking that perhaps I just like that really long back end and it is the ticket for me. Believe me when I say there is a difference in the way the bike rolls over bumps with chain stays that are 4cm longer.
The fun thing is that we all have what we consider the perfect bike, and then something comes along that rings a bell and wakes up our senses to consider something rather unconventional. Life is fun!