There will always be inflation or deflation with bitcoins too. And the inflation being slightly predictable helps a lot.
1. There is neither inflation nor deflation with bitcoin. You know when you'll have 21 million coins and that is it. Lack of inflation is not equal to deflation!
2. Inflation that is offered here with altcoin is not 'slightly' but 100% predictable. I don't understand how 100% predictable inflation helps?