It clearly wasn't working with Legard, so this can only be good, if only to try out a different idea. Brundle and DC are already good mates so the chemistry should be there from day 1.
We will all have to cut DC some slack of course for the first half of the season as he has never commentated before, just like Brundle in 97 (not full time at least - he did do some races with Murray before).
If DC doesn't work, Chandhok would make a great recent driver replacement, but I'm not sure Karun is interested in giving up his motorsports career just yet. Croft and Davidson shouldn't be moved, they work fine on radio.
Considering who Brundle is, alternatively, the BBC should consider an ex-engineer, mechanic, designer or team boss too. Speed had Steve Machett (Benetton engineer/mechanic) and I believe in Ireland they had Gary Anderson (designer) at one point? Might make a different angle to the coverage.
At the very least, they should consider hiring a new pundit to put alongside DC and EJ in the area of car design. Mike Gascoyne was excellent at China 2009, so someone of a similar standing would be great for explaining new regulations or controversial wings etc. (That said, Ted Kravitz does do a great job of this too, and Gascoyne seems happy to help the Beeb in those short clips).
Anyway, I'm looking forward to a refreshing change of commentary, hopefully DC avoids being too dry and follows Brundle's lead...and I trust Brundle to be quite good at conveying enthusiasm, he has been before.
At the very least, we won't have idiotic comments like "A wing's a wing". And I can't really imagine Brundle doing Legard's amillionwordsasecondohlooktheresVettelWebberdowntheinsideoverthehillKubicaHamiltonthatsnotwhathewanted.
Its a shame we can no longer play this game though