LOL... we smarks are fickle, aren't we?
Part of the reason I think they're doing this is because the writers themselves aren't completely sure what to do with the angle now that Hardy is back, so they're sort of stalling for time.
The same basic run-in three weeks in a row
is a bit tiring, but I'm not really sick of it yet... I'll see what they do with it. Hopefully it actually goes somewhere good.
If they had some patience, they'd have stretched the run-in's out like you said, so that the three attacks would happen over the course of two months. Then at Summerslam, say Edge does face Cena. Hardy screws Edge out of the title. From there, you have a solid setup for a two/three month feud.