Good points:
Let's break this down a bit further
1.Being able to handle pressure defense and break a press is key issue. It is possible that Kellie could find a set of players who could function as press breakers and they might not necessarily be the main PG. And some of this adaptation would also involving better coaching on how to handle the press more effectively. But potentially, along with Jordan, Rennie, Rae, Davis, and perhaps even Marta might be able to function in that capacity. But, this potential vulnerability is a concern. This conversation brings back memories of Shannon Bobbitt just driving teams insane with her ability to cut through a press, like a hot knife through butter.
2. Over the years, a fairly constant stream of criticism has been the team lacked a "real PG" and then players in that role took the blame for the team's suboptimal half court offense. If the LVs had better half court schemes, however, it becomes easier to be effective at PG. So we have a little bit of a chicken and egg dilemma. And the key to half-court sets is ball movement and player movement off the ball. So, having the ball in the PGs hands to long can be counter productive.
So, I think the more crucial issue may be solving the long standing puzzle of the LVs half court offense struggles. When a half court offense is really working, it is not always clear who is PG. This is a best world example but in the Golden State Warriors in their prime, technically played Steph Curry at PG but more often than not Draymond Green made the key passes as a point forward, sometimes it was Durant, sometimes it was Klay.
My point is that game and players are evolving to such an extent that these rigid positional classification may be obsolete or a sign of running an obsolete offense.