Inflation of EOS will be 5% maximaly. Its flexible.
Steem will have 1% fixed infl. to forever. ....eventually. Im not sure how much is it right now, 9%?....
Will you? Network capacity will grow with token price. Miners will have to expand accordingly to have enough storage.
If your app grows - you make more money (this is up to you), you can afford more EOS tokens. If it doesnt - you dont need more resources. Quick maths :D