These don't follow the numbered points listed above, but are merely my own thoughts on the current debate in a numbered fashion.
1) Monster Hunter has not been announced for Vita yet. I listed it as a PRO for 3DS, because there are TWO Monster Hunter games coming out for it within the next year, most likely. One is a port, yes, but the other is a brand new entry into the series. While it may be true that there will eventually be a Monster Hunter released on the Vita, until one is announced, it is an advantage for the 3DS.
2) All systems have a huge support, pretty much, before launch. Whether that support is continued after the system has been released remains to be seen.
3) I thought the phrase of "access to a huge PSN library" included the PSP one, but I rephrased it to include it. Whether or not Sony/other developers go through their own libraries to put their non-digital games on PSN remains to be seen.
3a) Until they either put all/most of the PSP library on PSN, having no option for those with a lot of UMDs is a big CON. I didn't say to put a UMD drive on the Vita; I simply mentioned (if you actually read the whole CON) that no option to either get a digital release of the UMD game, or no UMD peripheral would mean people with a lot of UMD games/movies are left in the dust. I know I wouldn't be too happy to have to buy a game again. In that regard, it's the PSPGo all over again.
4) I believe that the Vita doesn't have a clear system seller like Nintendo does. Let's face it, Mario/Monster Hunter sells, both software and hardware. While games like Uncharted do help push hardware some, it's not nearly on the level like the above games.
