Some inflation is fine (some would argue has some value/purpose) - what you don't want is too much inflation, or deflation ("hyper"). But I doubt any cryptocurrencies can truly solve it (Bitcoin least of all).
But what I find fascinating, especially from the Bitcoin crowd, is how they trash all fiat currencies ("because inflation!!"), but still use fiat to compare/set the price of Bitcoin.
Basically, without fiat to give it value, their precious Bitcoin is worthless.