nic777 said:

Putting Obi-Wan as the focus of the PT means an abrupt shift by ep4. Because ANH is Luke's journey and when we find out about the connection to Vader it kinda makes me wonder why we would be looking at Obi-Wan so much in the PT since the real story is turning out to be the destiny of the Skywalker family.

The OT was a story about a set of heroes and Luke played the central role. Vader only mattered as a Skywalker because of his late-revealed connection to Luke. Lucas retconned the series as the story of Anakin and by extension Luke. It doesn't need to be seen this way...

No doubt Anakin is an important character (because of his relation to Luke) but that doesn't mean he needs to be the hero of the PT. As BlueCardinal says, up until at least the end of ESB, we don't view it as a Skywalker story. With Obi Wan as hero, we see him early in ANH, he passes the torch, and it works really well as a story-telling device.

Nothing wrong with wanting to tell it as a Skywalker story, but it doesn't need to be done that way. There is just nothing abrupt in moving from an Obi Wan centered-tale in the PT, to him meeting the son of his old friend/student in the OT.