It certainly wouldn't be surprising. The current GB has likely all but forgotten the 1975 fiasco (I think sanderson would've been all of 10 years old) and probably the lessons learned along with it. In 10 years or so the GB will probably include a few more guys that have forgotten 1975, or weren't around at that time. If they've all bought into the lie that it was a few JWs that were overzealous with their speculation, it would be awfully tempting to start implying that 2034 is the new date.
Also, I think the JWs could really use a new end-times prediction. In the near term it'll get everyone amped up again (which will bring in the cash) and in the long term it'll clear out the fence-sitters (who probably aren't giving money anyway) which will allow consolidation of KHs (more cash coming in). Then, after it's all said and done, there will be left a fiercely loyal group of core followers who will actually be more convinced than ever of the divinity of the GB by the whole thing because it will be just too costly to admit that they've devoted all their time and resources to false prophets.