The only concern I'd have is this. Aside from bug fixes, which may or may not happen, what about those who choose not to buy a legal copy of this but still use their pirated versions? Will the communities begin enforcing piracy regulations and have these people banned? If so, then you risk losing a large chunk of your members who will scramble to go elsewhere? And if not, then how is it fair if somebody spends their $20 to make right with EB and Degica for a legal copy, and yet there is no reprimand for everybody else who continues to use a pirated version?
You can sell a game legally on this? Perhaps, but no more so than you can on other makers. Plus, if you opt to include the patches and plugs that were made available by third parties (DynRPG, for example), you break the EULA and can no longer legally sell a game using this editor.
You can legally own the RTP? If you are selling a game, great, except the resources are so out-dated and would clash with newer resources. But this all goes back to the community again. First, anybody who currently makes a game with RM2K or 2K3 is already illegally using the resources. Not to mention that these resources (at least the audio) is very commonly used in RMXP and VX/Ace already. While illegal, it's allowed as long as you don't sell the game. So again, will the community risk banning members who use these resources illegally (whether or not the game is commercial) and lose a chunk of their membership base, or will they continue to turn a blind eye to what's going on, which in itself would make selling a legal copy of RM2K3 worthless to the one guy who wants to do what is right?
If I'm not selling my game, why should I buy a legal copy if the community is okay with everybody else's pirated version?
My point in this is for it to really work, for this thing to really take off, the communities will have to be on board with the idea and enforce rules against requesting and using pirated copies of RM2K3. Only then will this drive the necessity for RM2K3 users to go out and purchase a legal copy.
But a large number of the communities probably won't enforce this because they fear they will lose a major portion of their membership chain, and a community needs its members to survive. Unfortunately, a large portion of the membership in several communities already have and use illegal copies of RM2K3, and won't be buying a legal copy.
And that's the other thing that worries me. Our communities have a pretty decent thing going on with Degica now, that I'd hate to ruin the relationship over a disagreement. The world has come to accept that communities allow use of RM2K3 resources and games, and EB has decided to no longer try to prosecute its use. But if the communities aren't willing to support a legal copy of this by enforcing piracy laws in fear of losing their members, how does that support Degica? Will this create an even greater mess for future products? Is Degica okay with continued use of pirated material when there is a legal copy that can be purchased?