The amount of connections and access this could provide to the regionals means it's a win win for the whole of the UK.
Note the word "could" - call me cynical, but it's a big "if" as to whether these connections ever materialise. Given the amount of money involved it's a big gamble for the regions to support (not that I'm dumb enough to think that the money would leave the south east if it's not spent on LHR)