I actually agree completely with Aïki, but I suspect you don't actually realize what he/she(?) just said.  Aïki really just restated what I had written when I edited the article summary a while back:
In common usage, the term "inertia" is sometimes also used to refer to an object's momentum, or to describe its "amount of resistance to change" (which is technically the same as its mass). It is important to understand that these uses of the term are not the same as Newton's more fundamental description of "inertia" as a principle of the way the universe works (which is not a measurable thing).
In other words, some people sometimes use the term "inertia" to refer to other things than the principle of inertia.  However, the principle of inertia is still an important and valid principle, and is the primary meaning of the term.  In many cases, one needs to use context to determine whether somebody is referring to the principle or to something else, but I think we've pretty well established from the conversation above that we're talking about the principle of inertia here, not the (conventional but inaccurate) other uses of the term.  (Aïki, please tell me if I have misinterpreted your statement)