Is Reality Finite? III

We can compare the future of science in Poul Anderson's Starfarers and The Fleet Of Stars with its future in James Blish's The Quincunx Of Time where Thor Wald, a successor of Adolph Haertel, states that:

in the twentieth century, physics was presupposed to be limitless;

however, Haertel proved that there is only one fundamental particle; 

now, physics is defined and self-limited, not endless;

the ultimate particles have a geometry of points, not of lines;

no further refinement is possible; 

the Unified Field Theory negates quantum mechanics.

However, a successor of Wald states that:

Dirac messages from the future present not only evidence contradicting the current scientific paradigm but also many mutually incompatible future paradigms;

fortunately, Wald devised a metalanguage which shows that science cannot be used to decide between paradigms because the structure of science is one of those paradigms.

(I thought that scientific method incorporated the successive paradigms but what do I know?)