Well first off they are fixing them, so there is a solution. If you do not like the turn time, which from what I read has gotten significantly less than 6-8 weeks, you can buy another shell. So a class action law suit would be difficult to do, you have prove that there is no response from the manufacturer. There is. Also the only people who gain anything is the attorneys involved who get paid first with any settlement, the rest gets divided. You will have to bring a law suit up to the courts first and then get the judge to make a class action by specifying specific data relating to mass failures. There is lots of squawking but hard to get real numbers as we have no idea of percentages of cracks vs units without. Class action suits takes years to resolve, there will be newer models or they will be discontinued long before there is any resolution. The quads are small change in real world numbers. The parent company is overseas, difficult if not impossible to prosecute or collect.
I agree there is a problem with the shells with some users. I have not seen cracks yet, that does not mean it will not happen. However there are solutions. This is a hobby item, it hardly stopping anyone from making a living so in the reality, get them to fix it for free, send it back. Take a vacation.
Alan