MPL or any other modification that puts very inexperienced bums in the right hand seat makes a nonsence of CRM... if it's accepted that someone with very limited or no practical experience is an acceptable 2nd pilot for a passenger jet then why the emphasis on CRM.. ? What high time Capt is going to want to discuss the viability of continuing an approach through and around multiple cells to a partially contaminated runway with a kid who's sh*tting himself just looking out of the window, or is too inexperienced to recognise the threat in the first place. It will be a single crew decision to proceed or abort.