McGregor did a damn fine Obi-Wan... Why couldn't someone play Solo?
Yeah, sometimes you just have to let go. Roles get recast all the time. Daniel Craig was great James Bond. Hopefully they'll find someone to be a great young Han Solo the same way they found a good kid to be Young Indy.
And I agree with you Jesse - cadet Han Solo would be a good place to start, but there are so many ways they can go - young Lando, winning the Falcon, working for Jabba, etc. It will be interesting to see which way they take it.