It raises an interesting question whether the EU will be encouraged to take a harder line, given the concessions that the DUP have achieved. I think they'd be misleading themselves if they are, since the DUP had particularly good leverage here.
I guess it all depends on how much pressure the EU themselves come under. At the moment, there's apparent concord between all the 27 other members, but you wonder how long that will last if there's a prospect of a UK/EU rift and smaller members see themselves at a disadvantage dealing with an important export market. So too, German industry, French agriculture etc if they genuinely think the negotiations will falter.
