Sorry the game is not alright as it is, you can't find a fight we are not bringing in numbers as fast as we are losing numbers. At this rate there is no real future for this game. Just trying to come up with ideas here.
The game is alright as it is, but there are a few "loop holes" a bunch of players have found that when they exploit them ruins game play for many people. What your suggesting will have the players leaving in droves. Forcing players to fly early war rides until they "earn" mid and late war rides isn't going to make anyone happy.
The only real problem with the game is the tendency of players to look for the quickest and easiest way to accomplish what they want. In a fighter that means drive strait at the other guy guns blazing. With a CV it's drive it right to shore. To capture a base it is to crush it with a horde and make it completely useless to anyone. If these "loop holes" were closed players would look for other ways to do what they want. If you make it so the CVs run aground and sink 10 miles off shore they won't bring them in so close and battles would last longer with them. If you make it almost impossible to capture a base with 30+guys, but fairly easy with5 guys which way would the players try to capture bases?
The loop holes have to be closed up to take the "gameyness" out of the game play.