They've been publicly sticking to 50m, but apparently (again, all as per Di Marzio, so salt needed - but he's usually okay on Serie A stuff) they're okay with a lower fee from Roma, and I imagine that they'd be open to a lower fee from us as well. Not *as low* as they'd go for Roma, but still lower than 50m - which no one will likely pay.
Maybe it's a slow burner or something. The trouble with that is that Arsenal losing Sanchez will make it likely that he goes to the Emirates - so if anything, we might need to preempt that if we're serious about getting him.
Erm..Barkley's better than people make him out to be, but he's no Eriksen replacement. Not by a long shot. More like an attacking midfield Dembele, if anything.
Mahrez would actually be closer to the ideal than Barkley would, if that's what you're looking for - quick, creative, decent size and speed, outrageously skillful, and can drift across the midfield. And while his work-rate is never going to be Eriksen-level (there are almost no AMs who work as hard as Eriksen does, imo), he pulls his weight in defense - wouldn't have survived in a defensive team if that weren't the case.