To my knowledge the major problem with CdTe panels has been the extremely limited availability of Te, which is probably the main reason why they're under 5% of

To my knowledge the major problem with CdTe panels has been the extremely limited availability of Te, which is probably the main reason why they're under 5% of the market today. If one expects solar power to grow even more in the future, that market share will almost certainly shrink further still. So disposing of CdTe panels is a self-solving problem in the sense that we can't manufacture societally useful amounts of them anyway.