Miller would be a great fit in LA, probably the best point to pair with Kobe. He's doing pretty good in Phila. as a point guard, and should have an even better year this season.
But Miller is already a bit old himself and not the quickest player by any stretch. His value is in his ability to make his own shot and to distribute the ball, and he's one of the best in the league at it.
The important thing for the Sixers is to be prepared to improve at this position next. If Lou demonstrates the ability to run the team, he might be an upgrade, being much quicker than Miller. Andre would be fine as a backup to Williams, but if Lou can't run the team as well, we'll have to try to trade Miller for a younger point with more upside potential.
Assuming we get Iggy signed we have a 3-5 year window to get to the finals and win it all, maybe even longer considering how young the team is. But Miller is 32, and he's probably not going to be as effective in another 2 years anyway. The only problem is, he's done a great job for the Sixers and it won't be easy to replace his production. Ed is probably figuring on ways to acquire another point guard out of all the disappointed free agents in the NBA.
Hopefully Lou will grow into the position, which will buy us a little more time to deal with Andre, but at 32 it's his age that's the issue. He held up pretty well last year, playing a lot of minutes. Since he doesn't rely on quickness, but smarts, it is possible he can continue to be effective for a long time to come.