Yes, it is good business sense...but then how did we end up with Thrillville. I don't really think anyone was looking for that.
RCT isn't dead completely, but it might as well be in terms of putting out a completely new game, not just sticking it on a mobile device and making it 3D (which I will admit it is pretty cool that they are doing). Honestly, I was very surprised to see this development so long after RCT3, so I'm not completely writing them off. I just feel that if they were planning on making an RCT4 (which is presumably what this topic is about) they would have spent all these years developing that, not a 3D version.
As for AoE, I actually really liked the third installment, its their attempt at an MMO that pissed me off, not to mention the visual graphics for the game went into the toilet with AoE Online.