If you ask me, they ought to bugger the diesels altogether and focus exclusively on steam power. What attention they'd receive, both within the 'railfan' community and in the media, as the only short line railroad in the United States operating steam locomotives for everyday operations.
There are probably only as many people who have commented on this thread (minus myself) who have any interest in the Arcade & Attica's diesel fleet. It's the steam that gives the A&A its flavour and appeal. If the A&A had the money (which, as we know, they don't, making this entire discussion pie in the sky, of course) they ought, in my opinion, to invest it in the steam and tourist aspect of the line.
And although prices at the pump are going down now, just wait to see where oil is, say, 5 or 10 years from now. I have an unhappy suspicion that one day, not very far off, it's going to be far less expensive to operate a steam locomotive than it will to operate a diesel one. And that mill at the end of the line, I think, may have its days numbered.
I hope to be proved happily wrong, but I think that if the Arcade & Attica wants to see a bright future, it ought to look to the past.