I can see certain benefits with Nintendo buying Sega or Capcom, but I can also see some benefits of a merger with a spin offed Playstation branch.
Sega is a tempting proposition since Nintendo would be landing Sonic, and would then be able to make an actually good game with him again. But what else is there for Nintendo to gain from buying Sega? Maybe Bayonetta. But what would happen to Creative Assembly, which is a PC oriented company? Would Nintendo start making PC games, or let them go? I think they've shown that they're ready to take on other genres than strategy with Alien: Isolation. But What would Nintendo do with Total War?
As for Capcom, there's 4 major franchises that would suit Nintendo quite well; Street Fighter, Resident Evil, Mega Man and Monster Hunter. Those games alone should warrant Nintendo to buy Capcom. Capcom could continue to produce all of those games while Nintendo could/would/should take Mega Man from them and show him some proper love. Another game that would suit Nintendo well is Okami from capcom.
A merger with Playstation (NOT Sony) is by far the least likely option. Sony isn't is such dire need of money that they would sell off one of their profitable division, but it would have been quite beneficial to Nintendo to either acquire Playstation or merge with them if they were to break away from Sony proper. They would make ONE console, with inputs from both divisions (Nintendo and Playstation) and have the best 1st party line up in the history of everything. It would be utter world domination. By all the gods, a Nintendo Playstation would crush everything. But PS would need some independence since Nintendo wouldn't know how to handle that brand and would surely fuck up if they were in charge...
So, looking at all the options in the poll, buying Capcom is the best way to go for Nintendo. I'd be more interested in seeing them start up new studios though, and begin new IP's
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