Meh. Other than the fact that they're both somewhat realistic flight sims, WT and AH are two very different games.
WT is essentially counterstrike/halo in the air. Round based, short instant action style fights. This style of game is extremely popular. Couple that with F2P, of course they put up huge numbers. McD's is extremely popular. Doesn't mean everybody wants it or would enjoy it if all other sources of food became unavailable.
AH is an open somewhat persistent world. 'Rounds' as much as they have them can take days. A very different style of gameplay that is less popular, but at least for myself much more desirable than two sides taking off at the same time and clashing in the middle.
I understand why people like games like WT, but it just doesn't appeal to me. Until there's another game that has similar FM fidelity to AH and open world style gameplay, I'm not interested. That I know of, there's only two like this. AH and WB. I flew WB for a few years then came over here for a couple reasons.
If there were something that was as much of a leap in quality above AH as there was going from WB to AH that offered similar gameplay, I'd be there instead of here. That I know of it doesn't exist. I don't know for sure, but I think there's a fairly sizable contingent of people over here who feel the same way. The style of the game is what keeps us here, not the number of players or planes, or the graphics.
I think a large reason the FRB has such a strong pull for some people is they like no icons and finally have someplace that has decent numbers to do it in. I say good on them. I have fairly specific tastes in a lot of ways and know what it's like to want something that not many other people do.
For my taste, about the only thing that has a shot at dragging me away from this game is Star Citizen, if they pull it off. Even then, I'll still FSO.
Wiley.