HTC needs to start subbing out aircraft and vehicle creation to the highly dedicated community. This is just taking too long to get updated cockpits and new aircraft. It would decrease the workload on HTC, make the community and players much happier, and give us a modern game.
True, It would streamline the process, but I can think of a couple of reasons' right off the top of my head as to why he keeps it in-house;
1). Accuracy. Any disputes' over the FM's of player-contributed aircraft could become down-right nasty.
2). Access to the coad. All you would need is for HTC's basic source code to hit the mainstream, and a little bit of time, before you saw people manipulating whatever they wanted to in the game. It would make it a hackers' playground. No thanks.
While I agree that it would be better to see the game catch up to other sims' in terms of planeset, I believe that now that they have some extra help, in the form of Waffle, they are able to get some things' out the door sooner. It would be too hard to ride herd on literally thousands' of people with access to the source code, though.