If you really want to solve the textbook crisis, solve the debt crisis in education and allow discharge of student debt in bankruptcy at the same time as you investigate the publishers for any type of RICO or antitrust activity.
Neither of these solutions work. If you can discharge a student loan through bankruptcy then no lender will offer them without a guarantee from the government and that will be really expensive. So if you go this way why not just have the government cover the tuition costs with grants which it recoups by charging a higher tax rate on higher incomes? It worked this way in the UK for decades before the government got stupid and massively increased enrolment beyond what society needed and taxes could support.
As for text book publishers they are not guilty of breaking any laws they are just exploiting an unusual economic model where the person choosing is not the person paying: their customers are professors, not students, but the students are the ones footing the bill. The solution is for professors to write their own texts and use either the open source model or the cheap, online publishing model. I've done this myself for a first year physics coursee - students can get the PDFs for free on the course website or they can get a hard copy from CreateSpace for US$4.74(with code)+postage which is about a quarter of the price the university bookstore would charge for it as a coursepack. About ~10% get hard copies and the rest just use the free PDFs - which without the annoying DRM/apps of publisher etextbooks are very widely adopted.