At least pilots will leave training after MPL with a qualification that they can use and not have to fork out more on Sims as is required with the current light aicraft based fATPL
Except that when you emerge from the MPL course with a B737 rating and find that there are no B737 jobs available, you will still have to find another bucket of money to complete a B757/A320/etc. type rating....or two buckets to complete the extra training to enable you to fly a SPA/MEP or do a FI rating.
I hear that the MPL courses must be 'sponsored' by an airline so it may be that the 'self-sponsored' option will not exist.