I kind of doubt I'll buy five more in my lifetime. I have desires that vary from day to day, but then I look at what I've got, and think, you know, my grandad got through life after WWII with one .30'06, one .22, and one shotgun.
I've got more guns than that now. Do I really need another pistol?
Well, that only sort of enters into it. I'd really, really like to get a couple more .38 revolvers. A 2" or 3" RB Model 10 or Model 15 S&W would be hard to turn down, as would a .22 J Frame, in a snubnose configuration. Just getting another regular square butt, 4" model 10 would be cool, too.
Really, I can't for the life of me think of another pistol I absolutely need to put in the safe. Besides those three, I can't think of one I really, really want. Yeah, I know, it's heresy. But really, I'm covered. I'd be buying variations on stuff I've already got, at best, and duplicates of them, at worst.
My next gun purchase will likely be a single-shot shotgun for one of my kids, or the pink AR my daughter was talking about.