Yes it's a pity that there wasn't a more cohesive policy regarding Crossrail - although Crossrail will link in to Woolwich which is 2 stops away on DLR. There is also a, rather underused, DLR station (King George V) one stop closer to Woolwich which has access to LCY - albeit blocked off at the moment...it would need a lift added to the northern side though in order to provide wheelchair etc access.
I wonder if there are any plans to open it up should LCY gain permission to expand following the recent planning inquiry? 2 terminals at LCY? One at existing London City Airport DLR station and one at King George V station?
Aside from problems of a bend in the track at former Silvertown station there is also an issue about accessing the airport from it through residential streets.