FUNi played the Chibi Wrap Party short at Otakon and while Al still sounded like Al, his voice was MUCH raspier than in the TV series and movie. His voice worked for that short, but I'm not sure how well it'd do in the new series, especially considering Dismuke's rather childish-sounding reaction sounRAB (which were perfect for Al, by the way). If Brotherhood had Al in his mid-to-late teens, the voice would be perfect, but for a 10-year-old it doesn't sound right.
Dismuke MIGHT be able to go back to his old voice (or at least a reasonable facsimile) in a few years, but I worry about right now.