Highly unlikely, although some people apparently harbour false hopes about it.
The point of Classic was that a number of cards differed from their Legacy counterparts, subject to changes (‘nerfs’) and whatnot. Wrote about Illidan already, too…
Besides, Legacy comprises other cards than former Classic ones (there’s a bit of terminilogy confusion here, but no matter), so there’s not even a convenient filter in the collection for them anymore — they’d have to ‘reinvent the wheel’, i.e. ban cards from the Legacy set that originated from Core (I think that’s it… or was there something else?) manually.
I dunno whether I should call this kind of fake positivity ‘toxic’… or just moronic.
The house burned down? Well, there’s something good, you could build a new one in its place! 
Actually, it’s more of just a failure than anything else…
But here comes this low-grade troll again (the ‘heroic’ tavern brawl adept, yes — these forums do remember), shilling for the company by trying to bark at other posters here.
Have you just realised this rather obvious point? 
I mean, no offence, and better late then never… I guess…
See, for instance, this topic:
Not that any of it has been that suprising, given the track record of this company, especially in the ‘Actiblizz’ form.