I would love to see WW1 come to Aces High. The first implementation of it would be relatively simple too. Just take a Stuka and go like this

and you have a Spad 13. Go from there. I'd love it!
My first experience with MMOLG was Red Baron II (which evolved into RB3D and RB3D-online). There were hundreds of guys online, squadrons, the whole nine yards. I was in the Lafayette Escadrille squad and these were some serious folks! Being my first experience and such a long time ago (mid 90's) I probably have more of a romantic memory of that experience than a realistic one but I'm telling you, it was a blast! Having to worry about your wings flying off in your Niuport 11 or not pulling G's while firing your guns else risking jams was very immersive. One of the coolest features of the online play was how they handled "radar" which of course, did not exist in any form IRL. Naturally, not having any way to see planes on the map would ruin online play, so the way they handled it was to use the least capable aircraft on both sides (Morane Bullet for the Allies, Fokker E.III for the Axis) to be used as recon planes. In order to "turn on radar" in a sector, a player had to fly a recon mission (unarmed) from one border of the sector to the other. If he made it successfully, radar would come on in that sector for a period of time (don't recall how long). You could then see all the planes from both countries once that sector was recon'd. Ah, how I loved that game!
I have always wished for a WW1 game to emerge and IMO no one could do it better than HTC.