I certainly hope that they will not do away with the Main Arena.
As for TOD, I personally have no interest. I expect the TOD to be just a jazzed up CT. There is a reason I don't fly in the CT; mainly because I don't like it. Wow what fun, you get to fly a Zeke against a horde of F4u's or a Spit1 against early model 190s and 109s. Such imbalance is not my cup of tea. I think the plane set in the MA gives you a lot of choice and balance.
And given the numbers who fly MA vs. the CT, it would appear that I am not alone in preferring the MA environment over the CT.
Personally I don’t care whether or not TOD comes. And when it does, I hope some enjoy it. But I also hope that HT will not decide to trash the MA.