I guess it depends on whether you consider each part of a version number to be its OWN number, or the entire version number as ONE number.
If it's supposed to be read as 2 or 3 different numbers, then 4.10 makes sense. But then they just shouldn't be using decimal points. Use slashes or dashes or colons or apostrophes or anything else. And it
certainly shouldn't be pronounced as "x-point-y", which is the standard pronunciation. You also shouldn't jump over decimal numbers in that case, which is routinely done to show greater differences between versions. e.g., Apple went from 8.1 to 8.5. So then the next version of iTunes may as well be be version 7.
OTOH, if it's one solid number, then logically there should never be more than ONE decimal point, since that's redundant at best. 10.3.9 = 10.39. But I always thought the second point was there simply to improve readability. And I still think that makes the best sense, personally.
There are very well-established standards when it comes to counting. And these standards say that 4.10 = 4.1 = 4.10000000... < 4.9.
If it must be dragged beyond 4.9, then I'd rather they go the ultra-nerdy route, and call it 4.A. No reason the version numbers can't be read in hex. ::ha:: Realistically, 4.9.1 makes the best sense. Or maybe 4.91.0 (same thing!).
I remember having a little argument with my brother a decade or so ago, because he kept calling Glider 4.09 "Glider four-point-nine". He said it was the same thing. Being a crotchety old nitpicker even at such a young age, I just couldn't let it go.
So as not to be criticized TOO heavily for taking this thread wildly off topic, I have some more features I'd like to see in iTunes 5:
Full QT video support. While I still sort of feel that the integration of a video player in iTunes is an ill-conceived concept, it's there, so why should it be artificially crippled? Apple still offers no free full-screen media player, which is utterly ridiculous. There's no reason iTunes couldn't play all QT content. In fact, they must have gone out of their way to prevent it. Go figure.
Greater range of volume control. It's important to keep the volume of my music balanced properly with the volume of other apps. Usually I want my music to be the dominating sound. But iTunes' current max volume isn't high enough. I can use the equalizer's preamp feature to boost it a little, but even that doesn't give me quite the range I'd like. The only perfect solution I've found is to use Audio Hijack Pro to reduce other apps' (mainly Safari's) volumes. I guess the proper solution is to increase the range of the preamp rather than the main volume. Whatever, as long as it gets the job done.
A simple backup/restore method. I can burn MP3-CDs, which I've done, but then it renames all my files and loses my directory structure. It's amazing what a pain in the butt it is to do something so simple.
Speed adjusting controls. QuickTime has always had the ability to play any content at any speed, and QuickTime 7 takes this one step further by dynamically adjusting the audio so you don't get chipmunk-pitched voices when you play stuff at double or triple speed (note: for some reason, this doesn't work with MPEGs, although it does work with mp3 audio in other file wrappers, like AVIs). I'd love to see this feature added to iTunes. It should barely take any effort, really, since iTunes already uses QuickTime for playback, IINM.
Built-in remote controls. Currently you need to use third-party utilities to get system-wide control of iTunes. Some of them are quite good, but iTunes really ought to have beefier features built in. Global keyboard shortcuts, an ultra-mini control window, and maybe a menu extra would be good.
Skins. Maybe. I've never been crazy about the idea of skins, but a lot of people go wild for 'em.
And most of all, a single, unified, global iTMS. I know, never gonna happen. But I can
dream, can't I?