The whole thing is an example of a red herring. Tying an earthly hope or a heavenly hope or anything else to partaking has nothing to do with the Lord's Evening Meal. Partaking was always about, "keep doing this in remembrance of [Jesus]," and "for forgiveness of sins" and 'proclaiming Jesus.' (Mt 26:27, 28; Lu 22:19, 20; 1Co 11:26)
WT's arguments about this are also an example of 'framing an argument.' You will never read them saying that the problem is that some people think that partaking is something all Christians are to do.
Always the WT will say that problem partakers are mentally unstable or are holding to ideas from their previous religion. But they never mention the idea of partaking due to thinking it is what Christians are supposed to do. And yet, this is arguably the main reason JWs start to partake. From the WT's viewpoint, mentioning this idea would only spread it to other JWs.
WT's real problem is that partaking, which implies being 'anointed', involves their authority structure. In WT theology, the GB are the only sure 'anointed' (i.e. rulers). Anyone else who partakes or claims to be 'anointed' is only accepted as such on a wait-and-see basis. They are true Pharisees. (Jn 11:47-50)