It wouldn't be hard to create a fork which is inflationary.

I agree it would make the most sense for a useful currency.

There was a coin I came across the other day which as the reward was the square root of the difficulty + block height but I can't remember what it was called. Still depending on what the base rewards were (if it was 1000 a block to start for instance) wouldn't actually be what you are talking about.

I disagree about the ASCI part though, to increase adoption it helps to be able to use the same tools. Inflationary rewards would mean insta mining with a big rig still wouldn't be a huge amount of coins 10 months later.