I love Ygrec too. It has been many years, sadly.
The most significant consequence of this change in style is, in my view, the fact that the more recent vintages are not markedly tinged with botrytis. It used to be said that Ygrec tasted like a dry sauternes, which in my (unfortunately limited) experience it did. I loved that distinctive style. It was flavoursome and characterful, especially with reasonable age.There's a big difference between recent wines, where the grapes are grown to make this dry - if not quite bone dry - wine specifically, as opposed to older vintages constructed from leftovers that were not used for Yquem. So expect less Semillon, less sulphur, probably drier and definitely much cleaner wines, rather than something which was a far more quirky Yquem offcut.
The one worry I would have with the aging the newer wines would be the cork dependency, but I don't know the track record of the recent wines wrt premox and whether the most recent vintages are bottled under DIAM.
On the other hand, unlike Pavillon Blanc de Margaux say, the price seems to have been remarkably stable over the last few years.