It looks like that low in the atlantic might actually cause ida to take on more wind shear and therefore break it up a little but that might also be the reason that the low sits off the coast for a while. when these two systems combine without that 3rd element they do not "blow up". if ida stays on track it looks like it may just rip apart that other disturbance. Don't forget the atmosphere is always trying to become balanced and having two systems especially this late in hurricane season usually doesn't happen.