I really think the Mid Cornwall metro is a badly thought out vanity project by the previous government as a fob off to make people in Cornwall think they've been considered. My main reason for thinking this - trying to link two branch line services, with a reversal (Par) via a mianline which sees services often delayed due to the fact their departure points (London / Scotland) are so far away. These mainline services will always take precedent, so even if a metro service is just five or so minutes late, the precision timings needed to keep the Falmouth line running correctly can't be kept. I suspect the Falmouth service will be the biggest loser out of this, services often cancelled to regain time and then overcrowding on the following service. No increase in service frequency from Falmouth to Truro.
Improving the Newquay service - great, and if there is enough flexibility that the odd ten minutes late here and there doesn't matter, maybe extend some services to Plymouth or Bodmin. Improving the footbridge at Par, all of that seems sensible but I can see a couple of years after this all begins, services will be "quietly" returned so something more like they are now, with an hourly service to Newquay.
Who in Cornwall has ever complained about changing trains to get to somewhere like Falmouth anyway? Truro is a very easy station to negotiate