If you go into the archives, you will see that my hypothesis did not have God turning all dinos into snakes. Rather it has the reproductive genes of the dinos living at the time of the fall being transformed via the curse to cause all the offspring of the then living dinos to be born as belly crawlers.
Furthermore I have consistently alleged that the likely the parent dinos lived all the way up until the flood which would have been some 1500 years or so. The atmospheric pre flood chemical makeup, et al, imo, could translate hundreds of years into millions of dating years as per the chemical makeup of the environment today. If man lived around a thousand years, it is feasible that the dinos could have lived until the flood caused their extinction, only the young offspring belly crawlers being taken in the ark.