That might might be overstated. The Wellington was built in three Vickers factories, Blackpool, Chester and Weybridge. In chronological order, the first Weybridge built Wellington was delivered in July 1938, the first Chester built Wellington was delivered in August 1939 and the first Blackpool built Wellington was delivered in August 1940.Vickers were committed to their geodesic construction. Hence still churning out Wellingtons to the end of the war.
However, the Chester factory also built 235 Lancasters out of 1,620 Lancasters and Lincolns that were ordered from that factory. Therefore, it might have been possible to abandon geodetic aircraft sooner had something better been available.