[lightarrow]

Sincereley I don't have enough knowledge of QFT to understand what you have written.

[lyner]

Can both ideas coexist?

Why not? It would be very rash to presume that either one was 'the truth' so use one for some conditions and use the other for other conditions. After all, you wouldn't expect a structural engineer to invoke Quantum Theory in bridge building; you'd expect Newtonian Mechanics to describe the situation perfectly.
I should have thought that there have been enough revolutionary changes over the last hundred years to teach us to know better than to believe that the 'next step' will take us to ultimate knowledge.
Be eclectic and avoid frustration.

[yor_on]

Your answers are, as always, most appreciated.
And yes, you make sense SC.
I guess that even if we had an inkling towards a theory of everything, that approach would still make sense.