Agree, for the most part.  Once the ratio of your investable assets to necessary annual income exceeds around 30 to 1, then inflation is your friend, as long as you know how to find the asset classes that are inflating faster than the currency you're using (this ratio is debatable - I personally go with 10 to 1 because I'm confident in a 10% return annually). So, you could have W-2 income of a million per year, but if you also spend a million per year, inflation is not your friend.

Another way to look at it, if you need 100K to get by per year and have 3 million in assets (not including primary residence), then inflation is your friend....but that's still very middle class.
** There are a crap ton of assumptions built into this post. Keeping things simple sacrifices accuracy.