Question

Hello Rabbi, festive greetings. 
I saw that Rabbi Eliezer Melamed wrote: “As a result of the exiles, uncertainty arose regarding the volume measure of an olive. Some say that the olive commonly found among us is smaller than the olive spoken of by the Sages, which is a little less than one-third of an egg. And some say it is about half an egg. Although it appears from many medieval authorities (Rishonim) that the olive spoken of by the Sages is the olive commonly found among us, since we have an established principle: ‘When there is doubt regarding blessings, we are lenient,’ the halakhic ruling is that one does not recite the after-blessing for less than the volume of half of a medium-sized egg of our times. And although it stands to reason that the volume of the olive has not changed, it can be explained that since the Jewish people adopted the practice of treating the measure of an ‘olive’ as the volume of half an egg, then today, according to our perception, one who eats less than the measure of ‘half an egg’ is considered to have eaten an amount that lacks sufficient significance to warrant a blessing over it. And since the basis for establishing the measure of an ‘olive’ to obligate an after-blessing is from the words of the Sages, Jewish custom has the force of the measure established by the Sages.”
 
Do you agree with this novel idea he brings, or should one simply go with the measure known to us (the size of an actual olive), and that’s that?