Why not? Most journal rankings, such as Scimago's, deal with network measures (SJR), publication, or pure citation measures. The business model behind journals is a different thing. Of course, it is a good idea to investigate the correlation between rankings of a certain type and business models. If it turns out that certain business models lead to better rankings and if those rankings are deemed important then those responsible for using other models should conclude for themselves. All this has nothing to do with fairness.
I still think that fairness is an issue because not every researcher can support fees or have sponsorship to publish in open access system. Or maybe the right word is equity, instead. Sometimes authors have no choice other than to publish in no open access journals, and that can seriously affect the number of downloads and citations.
Ranking of a journal depends, among others, on the visibility, citations, reads, downloads, ..., and publications in open access journals, besides the quality of the authors paper and of the reviewers scientific quality, implies author's mandatory payment of fee. Thus, the selection of a Journal to submit a paper is biased, you know that the publication does not depend only on the quality of your work, but also on your available money support/sponsorship.
business models are constantly changing and we are witnessing one such modification: from subscription models to open access and hybrid models. A classic economist might say "let the market decide what's best"
I find it more pressing to ascertain whether scientific articles should be the product of someone else's business...
Yes Nuno, that's the only way, "let the market decide what's best" , the problem is that it takes too long to understand that choice ;)! Thanks for your pertinent comment.