If Wikipedia says that, Wikipedia is wrong.
Victoria, Victoria 2, Victoria 3 and Victoria 4 are separate figures. Victoria 4 got an upgrade in the form of Victoria 4.2. These figs were built on Poser tech, and pretty much made Daz. At about the time of Vicky3, Daz built studio as a means of selling more figs. Poser is costly, and the idea was to make a lower cost alternative. This also worked out well. So well, the stopped selling studio and just gave it away.
Since Poser is proprietary, Daz had reason to develop their own tech, and Studio diverged. At some point they decided that they should just make their own figure technology, as well, rather than just making poser figures. Genesis was that figure. I don't doubt that was a tough call for them. Vicky4(.2) was (and still is, last I heard) the most popular figure, ever. Building something completely new was risky. And it didn't pay off.
Genesis worked well enough, and people seemed to like the universal nature of it. But it is hard to work with from a development POV, and it didn't displace V4. Also, other people hated the universal nature. So they made Genesis 2.
Both Genesis and Genesis 2 were built using Daz's "triax" weight mapping tech, which no one but Daz uses. This was another issue.
Exported figures don't behave the same way in other applications as they do in studio because of this. So, Genesis 3 happened. G3 was developed, from the base, as means to connect to the larger ecosystem of 3d shit. That is, games. Everything from the low poly nature (compared to V4), basic weight mapping, to the use of bones for secondary flexing and facial movement was down to the fact that these things are standards now in Games and film animation. In a sense, G3 was conceding that they would never knock Vicky4 down. They just had to wait her out. She'll die some day. G3 is a play for the wider industry.
After Vicky4, each Genesis figure has had its own Victoria. Victoria (and Micheal) are "flagship" products for Daz. If V8 happens (it will soon enough. Just depends on when Daz feels ready) it will, almost certainly, be on a new Genesis figure. The only way that doesn't happen is if Daz takes its next figure base and brands it as something other than Genesis.
While they could do anything they like, right now their naming scheme assigns "Daz generation" numbers to their flagship products. Victoria 6, Sunny 7, etc. Victoria and Micheal were Generation 1. Gen 2 being V2 and M2 and so on. Generation 5 was genesis with Victoria 5. At that time, they weren't doing that whole number thing with all of the flags, so only shapes that related to previous figures (The Girl, Aiko, Freak, Stephanie) got the 5 with Genesis. With Genesis 2, ALL the flagships got the 6. Same with Genesis 3 and the 7. Mika 7 is the first Mika. A product made, according to the marketing, because Aiko was no longer anime enough. Which makes Mika the successor to Kieko 6. The point being, outside of Vicky and Mike, Daz doesn't much care about the names. It's the numbers.
So, like I said, they could do anything, but to build Vicky 8 on a Generation 7 figure would break their pattern, and I think it's an important branding pattern for them. Daz want buyers to feel like those numbers mean something, even if they aren't sure what. I think they know that their user base will feel Vicky8 is a cheat if she isn't built on a Generation 8 figure. So if we see a Vicky 8, it will be on a Genesis 4 or equivalent product.
Hell, if she doesn't show pretty much the same level of tech improvement V7 had over V6, people like me will see it as cheat, anyway (much like V6 vs V5, in my mind. I know why they did it. V6 is easier to code/model for than Genesis. But, as an end user, I don't care. Admittedly, I model and code figures now, so I should, but I didn't at the time.) Aside from being easier to build for, Genesis 2 didn't really offer any advances over Genesis. G3 did. If G4 doesn't offer advances, I'll just be annoyed until I figure out/build tools to reverse G4 stuff for G3. I've got too much invested in G3 to feel otherwise.