A lot of these suggestions are essentially abandoning the entire concept of a
flight simulator. I get that we want to attract new players, but sacrificing what this game is at its core is entirely the wrong way to go about doing so.
I can't speak for others, but for me, the difficulty and learning curve were a very large part of the draw for me to begin with.
If HTC wants to bring in more players, the answer is marketing. You advertise, you update your website (so much needed here - there's a whole thread for it, but in short: a blog for generating lots of fresh content - which will help the next part, optimizing the site for search engine visibility {this is SEVERELY lacking at present}, and modernizing its design), extend your trial period to allow new users to get their feet under them before having to pay, and maybe offer incentives for referrals. Say, get a month or so free for any referrals that subscribe after their trial.
The loss of quality players that would likely result from scaling down the realism and difficulty would FAR outweigh any benefits of an influx new, inexperienced, and unskilled (not that I have much room to talk here) arcade-jockeys.