I don't necessarily mean to single you out, but I think this post is a really good example of the problems with this never-ending argument.
You have one side that is talking practical (I'll submit that there is fanboyism at play of those that simple want MH to remain on Nintendo platforms, but I don't think that's nearly as prominent as the opposing side wants to paint it as), with the other side talking more about their personal bias backed up with hypothetical ideas of why that bias is correct.
The simple truth is that the series has become the hit it has on handhelds, starting with the PSP and continuing on with the 3DS, where it's grown and grown to being one of the biggest franchises in Japan, selling numbers there that most companies would love to see worldwide. It's just now getting a foothold in the west, but even then it's not nearly where it's at in Japan. Ignoring the fact that the series was never popular on consoles in the beginning, it's crazy to me that people can't see the issues with just yanking the mainline series from the handheld market where it's ballooned into a massive success to go to consoles. It would be one thing if the PS4 was blazing in Japan, but the console market there has remained soft and really doesn't look to be exploding anytime soon.
The logic basically boils down to stuff like, 'Well, Souls is popular here, and it's kind-of-sorta-but-not-quite-really like MH, so I'm sure MH will be a huge on consoles in the west, too!' It'd be such a risk to burn the audience that they've built up just because Dark Souls is popular in the West, and if it did tank, by burning that audience, there would be no guarantee that audience would still be there for a return to handhelds, at least not at the level they left at.
Obviously, the grand compromise is to do something like Square is doing with DQXI and create both a handheld and console version of MH5. The handheld version would obviously be geared toward the main market of Japan, with the console version both trying to garner fans in the west and trying to jump start the console market in Japan. The problems there, of course, is that Capcom's financial situation isn't near what it is at Square, and that Capcom doesn't seem to have the vested interested that Square has taken on to push the console market. So, unless Capcom can get one, or both, of the platform holders to pitch into it, I don't see that happening.
I don't have any issue with people wanting MH on consoles. I get it, I do. But I really hate how those on that side of the argument just ignore the reality of the situation to emphasis their personal bias for where the series goes.