Having a sub-forum for every game is there for a reason. I comprehend why you think Tower Defence is getting desolated. If no one brings up suggestions to help improving Tower Defence, I would definitely not get updated anytime soon. And that's why it's very important for you, and the other players that still play Tower Defence, to come up with some good suggestions. I do think they should consider fixing all the current glitches, though. If Tower Defence doesn't get a few changes, I am frightened it is to be feared that the current situation will further deteriorate over the next few months. I am aware developing is hard and takes a lot of time, but the game must be fixed.
Trust me, the staff members to listen to the community. I do not know if they are debating all the problems in Tower Defence yet, but they could. It'd b great if the staff members do so. The current number of players playing Tower Defence is just really low, sad enough. Without any changes being made, the situation definitely won't better. Though, if there are other updates/bugs that have a slight priority, it might take a little while for Tower Defence to get updated again. I completely agree with you, but you, or anyone else that has free time left, should consider making a thread about all the little problems in Tower Defence with a good example of how the developers could possibly fix them. I am 90% sure this thread will get escalated, as the staff should really see Tower Defence as a problem.
I've brought up a few before, such as not being able to see a giant's health or a cave spider's health. I've heard that neither were fixed. I'm no longer willing to go in-game myself and check.