to answer your question, I have a 10yr Exora which the parts still can be bought from Proton spare parts center in shah Alam and I've seen other exora owners still send their Exora back to proton SC. The Iriz and Persona is still in production although the exora has stopped producing. so the parts is sharable among models.
its engine is similar to the Iriz and Persona VVT minus the turbo. so parts are easily obtainable.

so please don't have that mindset that proton is for short term usage.
and btw I love both proton and axia btw,

I thought law dictates need to have parts 10/20 years after phase out?