Kick the tyres,
You know where todays captains get their experience, I'm sure, but just in case you don't...
Todays Captains get their experience from all sorts of places. Some still from the "traditional route", and some from SSTR straight to a jet and then spend three to four thousand hours in that jet. In the future they could get it from an MPL course and spend the same three to four thousand hours in the right hand seat of the jet. All these people make perfectly good aircraft commanders.
I made no comment on the good or bad points of any way of getting qualified.
All I pointed out was that you were wrong in attacking captplaystayions comment about why there are two pilots. There have been two pilots on public transport flights since the 1930s, CRM has been around since the 1970s.
CRM is not the reason for having two pilots. CRM is about how the two pilots function together once the regulatory authorities have decided they must both be there for the safety of the aircraft and it's passengers.