The most common response to questions that our generation asked was: DWAT. We haven't seen proton decay? DWAT. No Higgs? DWAT. No Gravitational Waves? DWAT. Needless to say, after having thought quite a bit about physics over the years, by the time it came to the observations of type IA supernovae my generation greeted the supposedly obvious explanation with some skepticism.
On page 210 of TWP, Smolin mentions Milgrom's Law, which is the observation that the apparent breakdown of Newton's law in galaxies occurs at a scale whose value of acceleration matches the apparent acceleration of the cosmological constant. Rather than follow the r^(-2) law, outlying bodies appear to obey a r^(-1) law.
Now it was shown by Bertrand  in 1873 that central forces for closed orbits can only obey one of two possible laws: either the r^(-2) law or the r law (Hooke's law). The latter is the inverse of the law that we would like to obtain. Is there a simple way to rescue this situation? Yes, of course. When there is a correlation between a cosmological scale and a local scale we should not be afraid to apply T duality and/or S duality to the problem. M theory dictates that this is indeed the way to look at things.
We can then remove ourselves from the empirical world of MOND by viewing the effect as Dark Matter in the form of black holes. This is still a form of modified gravity, so both of the popular views may be seen to be correct, in some weak sense. The black hole picture can explain why we should expect a correspondence of scales, because the cosmic horizon is naturally correlated to Dark Matter in this form.
 Goldstein Classical Mechanics