I think it would be more likely to see the original trilogy remade because that's what people love, and it has been more than 30 years. I don't even think that will happen, but there would be a bigger appeal for the studio to remake something beloved rather than something people (for the most part) disliked. And I think the whole mentality of "If I shove my head in the sand and pretend it doesn't exist, then it doesn't exist" is rather silly, because even if they remade the whole prequel trilogy, it wouldn't erase the fact that those movies exist and are cannon. If anything it would make things worse and more complicated, because you would have two sets of telling the same story.
Also, they referenced the prequels in Force Awakens so they're definitely not ignoring it completely, even if they're wise enough to not put any major prequel-related things in the forefront of the new story. You also have the rumors of Hayden possibly returning in some capacity (a small role probably), and while it's not confirmed and may not happen at all, there's no smoke without fire like they say. The fact that his name is even mentioned in rumors signals, at least to me that the prequels are very much cemented as cannon and they won't ignore that. Also Ewan voicing Obi-Wan as a small cameo in TFA, which I doubt they would do if they didn't consider the Ewan-Obi Wan part of cannon.