Which is why a number of Allied leaders hoped to win the war quickly. They didn't know for sure how many V2s Hitler had or if he could have made them more powerful and more accurate.
In the end he didn't have enough, and they weren't powerful enough nor could they be guided as accurately as Hitler wanted.
Also, one ton of explosives per shot was not very much when allied heavy bombers could deliver at least 5 to 10 tons per plane and in 1944 thousand bomber raids were common for both the US AND Royal Air Forces. A missile needs a force multiplier like a nuke to make them more threatening with the guidance technology available in WW2, and Germany was not even close to being able to build a nuke, and the V2 could not carry it anyway. It's direct descendent, the US Army Redstone, could, but it did not go into service until the mid 1950's.
Hitler would have been better served by using what went into the V-2 program building heavy bombers or tanks.