In an ideal world, I would wish to see the following:
1. Obtain PPL.
2. Achieve sufficient experience in PPL flying to take the FIC.
3. Obtain FI rating which includes right to receive remuneration for flight instruction.
4. If you want to become an airline pilot, either build hours and money towards CPL/IR through flight instruction - or go down the MPL route. If not, just enjoy the profession.
This would mean that the oft-despised 'hours building for people-tube' folk won't have an enormous CPL/IR cost hanging over them for which they need to fly every hour they can whilst attempting to live on a pittance.