I want them to keep making more, but at the same time I don't. I don't think they should keep pumping them out so fast. The V4.5 was totally unnecessary and probably just made to squeeze out some more money. I'm afraid they'll just keep making newer versions with all the features of the last version one plus some. Eventually, you'll have an overly complicated virtual pet that could end up being too demanding to care for because there's just too much to do with it.
I don't have a V5 yet, but I do think it's nice that it has some new features while removing others. I've heard from other people here that you aren't responsible for your V5's education/career. A lot of people are complaining, but I think the lack of careers is a good thing. Could you imagine trying to keep track of the skill points, schooling and pay checks of 5 different Tamagotchis on a single toy? You wouldn't have time for much else! I think it would be a hassle more than anything. The way I see it, since the Tamagotchi's real parents are there instead of just you, they're responsible for sending them to school and stuff, which makes sense.
So yeah, hopefully Bandai's on the right track. In short: Keep making Tamagotchis, don't pump them out so fast, and don't be afraid to try new features while dropping others.