Deleted member 1487
The Falke was designed as a light single seat fighter. Had the single seater been developed and up-engined, it could easily have become the German equivalent of the P-38 and been a much better long range escort in the BoB than the Bf 110, which was too large and heavy for such a role. The RLM directive to change it into a two seater really killed it, essentially adding lots of dead weight without even adding a rear defensive gun.
However, it is wrong to presume that an aircraft initially designed around one type of engine will automatically perform better with more modern and more powerful engines, so it is pure speculation to hypothesize that the single seat Fw 187 of 1938 could have been progressively re-engined with DB603/605 engines and still been a top-tier air superiority fighter in 1944 capable of meeting allied fighters on even terms. Given its extremely narrow fuselage it would also have been less well-suited as a heavily armed and armored bomber destroyer than the Bf 110, Ju 88, or Me 410. Only in combination with a overall different Luftwaffe strategy with respect to strategic bombing does a long-range escort fighter really makes sense for the Germans.
Also, on another thread where I'm having this discussion with some people who have the book that is the best source of info about the FW187:
http://www.amazon.com/Focke-Wulf-FW...=1370312799&sr=8-1&keywords=Focke-Wulf+Fw+187
It appears that the FW187C, which would have been the 1942 production version of the Fw187 with the DB605s, was to have 4 Mg151/20 cannons in its nose, which would have had enough ammo for 6 passes on heavy bombers. Four of those 20mm cannon with explosive rounds would have shredded a bomber in a single pass, even the B-17. So it would have been an effective bomber killer in 1943-44 if it could keep its speed increasing with the increase in the DB605's power (I don't see why not, especially as it would have been adaptable to higher altitudes more readily than say the Fw-190D due to its size and wing span). Its high climb speed would have made it very effective as a bomber interceptor, as it can get up to altitude more quickly than even a single engine fighter like the Me109G, though not as fast as the Me262.