I believe very strongly in the subconscious training and manifesting power of ritual. This feels like a very strange thing to do in a religion (Christianity) whose whole doctrine and very existence centers around this one rite that commences and relives a covenant with their god to place people in an observer/denial stance. Very, very strange indeed that the witnesses would have people pass it up.
I doubt Jesus intended it to ever be regarded as a mere ritual or subconscious training, which can work just as much for the bad as good.
JW's do not view Jesus as 'God' the same as the Father is God (they consider the Father alone is almighty as 'the only true God' John 17:3 and 'the only God' John 5:44 NIV), so the 'ritual' is not a 'covenant with their God' . It is a covenant with God's son.
The reasons, as you said you are aware, why the majority of them bypass the emblems is because they don't feel any 'desire' to go to heaven, or at least that is what they imagine they feel. The teaching that conditions that feeling (imagined or real) is that only Christians who are going to be co-rulers in the kingdom of heaven are to be in the covenant that Jesus concluded. As the kingdom is in heaven they feel, or have been conditioned to believe, that there should be some accompanying magical calling, pull, or realisation that they are going to heaven. The converse could be said of all the 100's of millions of Christians who perfunctorily partake of the emblems. They all say they have a desire to go to heaven, but do they really? Or is it based on dogma and religious sentimentality?
If the Society came out tomorrow with 'new light' that in fact all of the 'great crowd' are going to heaven after all and Charles Russell was right all along about the great crowd being a secondary 'heavenly class', you can bet your bottom dollar that the number who partake of the emblems next year will hugely increase, thus proving that whatever 'calling' one feels is probably largely attributeable to whatever dogma you have swallowed coming down from the religious leadership.
What strikes me as an especially bizarre twist of weirdness is that JW's answer the question 'how do you know if you have a heavenly calling or an earthly calling' by pointing to Romans 8:15,16, "...by which spirit we cry out: "Abba,' Father!" Yet both the 'great crowd' and the 'anointed class' both cry out 'Father' to Jehovah, do they not? In fact, arguably JW's have a greater awareness of the Father and worship/cry out to Him much more than any other religious group. Nearly all other Christian religions believe that evidence of adoption by the holy spirit revolves almost entirely by having a supernatural experience in relation to Jesus, 'accepting Jesus into your life' or asking him to come into your life to be the Lord of your life, similar. In effect, other Christians cry out "Abba, Jesus!" not "Abba, Father" (the Father is quite clearly not Jesus.)