I can understand the scart to the TV for SkyHD - its all they have known and know no different. Theres normally a thread on certain other forums for people saying that they cant tell the difference between SD and HD, and normally get told that they need glasses. A change-over from SCART to HDMI would have certainly been quicker with if companies like Curry's and the late Comet did not charge £80 for a stupid HDMI cable as well.
Port replicators are great in theory, unfortunately its the companies themselves that screw it up. What I mean is, is when you come to replace that port replicator for whatever reason, its quite often prohibitly expensive and you might was well buy another piece of equipment itself. If TV manufacturers sold a replacement port replicator at 60-70% of the cost of a new TV, then thats stupid.
