Given the recent anger towards V5, stronger now than ever for whatever reason, I'd like to chime in with one of my own: V5 is not bad, nor is it responsible for "killing Vocaloid". Is it buggy? Yes. Is it not as accessible? Yes. Am I sad that Yamaha doesn't have a lite version that more people could use, like myself? Hell yes. But a LOT of blame is being misplaced. It's an overhaul, and one that focuses more on pros than hobbyists, and its marketing left a LOT to be desired. Yamaha screwed up with it, and I won't deny that for a moment. But the repeated cries of "V5 killed Vocaloid!", while I used to agree, just kinda... I dunno. It rubs me the wrong way.
I don't think it was the best direction to take, but you have to remember, at the end of the day, that Yamaha is a corporation. They have to focus on what will make money, as well as their own vision for the software. V2 support was discontinued mid-V4 Era because, even by then, they were really old. Remember that software ages extremely quickly. I'd love to see V2 support in V5 (imagine Big Al on the V5 engine!), but I understand why they dropped it. As for the claim that it killed Vocaloid... Vocaloid's quickly becoming outdated anyway. It's been around so long that it may be hard to imagine a world without it, but if it kept on its current path, that wouldn't have changed where it is now, and I firmly believe that. Maybe V5's overhaul was Yamaha's attempt at modernization (because, let's be real, V4 looked pretty outdated, especially near the end of its lifespan).
I have legitimate complaints against it, sure, but I'd hardly go to the lengths lots of others have and say that it poisoned our water supply, burned our crops, and delivered a plague upon our houses. Seeing people left and right dish out hatred for it has gotten exhausting.