if they move the Great Crowd anymore, they will be back to Russell's teaching that the two 'classes' live in heaven
They will never do that, for two reasons: first, most of the success of the WT religion, IMO, is due to their promising everlasting life on Earth, a niche that is not exploited by any other christian sect; second, a clear distinction between the two classes has to be maintained, because the GB needs to back up its claims of authority and they cannot resort to apostolic succession like the Pope.
I agree with Wild Turkey; I think the whole issue is a smoke screen. The real issue being that they need to validate the "new annointed" some way or another, because very shortly the GB will be almost entirely composed of people born after 1935. And they would have to admit that Jeho-bah has been doing a lousy job selecting the annointed, if the number is not yet "sealed" because continuous replacements had been needed for about 70 years. The easiest way out of this is to say that both classes of Christians had been selected "in parallel" during these two millenia, not one after the other as they now believe, and that the 144000 are not yet selected, and for that reason "the end" has not come.
What they do with articles like this is to draw attention to the text in a non-traumatic way, little by little, giving the impression that "the light is getting brighter". Whithin a year hence, the real doctrinal change will come.
Remember that they used the same strategy in 1994/1995 with the "this generation" issue.