Indeed, Steemit / Steem is a great project, with massive potential, and the future looks very bright.
Even if Steem is inflationary, any inflation will not be at the whim of a bird-barined central banker at the control of the money-printing press (as most inflation is). Since Steem is created by the network in order to reward contributions, I believe its value will be closely related to the overall value of the network / platform.
Given the growth of the internet, of companies such as Amazon and Google, and of Bitcoin and Ethereum, let's assume that Steemit experiences similar growth over the coming few years.
While such growth may not result in a Steem price of, say, $100 or even $1,000, it may conceivably result in the creation of many more Steem tokens. So, instead of getting 100 Steem (@, say the current $1.00) for a great post of quality content, a Steemian might earn 1,000 Steem, for the same post. Or maybe more.
(Just something to consider. If this post shows my utter lack of understanding of the finer points of the Steemit reward system, please enlighten me.)
Most of the top currencies (e.g. BTC, LTC, ETH) are inflationary for the time being. It takes $2.2M daily to keep LTC at current price (more info: https://steemit.com/steem/@penguinpablo/putting-the-steem-inflation-into-perspective). If the network grows at better space than the STEEM inflation, its price will increase. STEEM needs better distribution (e.g. distribution among large number of HODLERs) which takes some time (e.g. LTC peaked at $48 in December 2013, down to $1.1 in January 2015 and now back to $65, between $48-$1.1-$65 it got distributed, it is still inflationary). However, trading volume (e.g. speculation and marketing) keeps price inflating in short term rather than fundamentals (e.g. BitConnect).