that's what satoshi did - rather than arguing about deflata-coin (current bitcoin ), he just came out and did it to see what happens, in an experimental fashion. so do the same.
my prediction, however, is that you'll have a hard time attracting significant mining power.
If I was gonna do it, then I probably would set it up with the following parameters.
Same 21 million just like Bitcoin. There is nothing wrong with this number. But instead of 50 coins for the first 210000 blocks, I would make the reward try to mimic an objective measure of the community size with a formula.
Here is an example formula (BTC per block) for that: B * (ln(difficulty)2 / 4) where B is a percentage of coins not yet distributed (1 for 21 million, 0.5 for 10.5 million, 0 when they're all distributed).
This would result in 50 coins being given out per block once the difficulty reached 2.3 million. Current difficulty of about 70000 would pay about 30 coins. If I fired up just my own GPU's (eight 5970's), the difficulty would be about 700 and the payout would be about 9.50 per block.
Then I would correlate the maximum block size with the difficulty.
Okay, I see. You are not proposing inflatacoin as others are saying and I didn't think so. Basically, you are proposing that instead of the block mining payout drops (every 4 years) to be a smooth transition over time and to be more loaded to the mature network than the immature network. What about keeping an incentive for mining after the 21million BTC have been distributed? Still have fees?