Edit: my apologies for reading this as a more broad issue and if I don't understand the historical context of this policy...
Nintendo are THE example that devs can't be trusted to treat audiences with respect, nor can they be trusted to act in the interests of maintaining a competitive marketplace. The PS2 should live long in the memory for companies like Microsoft, a reminder of how competitors can suck in content by virtue of every success and establish insane dominance. Publishers need Microsoft's platforms at the moment, as they are one half of the equation when it comes to their big AAA releases. I don't blame them for protecting themselves from shoddy late releases and abusive publishing practices.
Like I say, I appreciate that for Indies this is a whole other matter, and is causing Microsoft to lose games - but again - some indie games have value. If you're going to lay with a competitor and release at full price, why should I let you port that product late, again at full value, when its lost whatever value it had in the indie cultural zeitgeist and ceased to be 'new'? Better that you add value for any subsequent releases anyway. Not just for the benefit of the platforms you release late on, but for the benefit of keeping your game fresh IMO. Of course I'm aware that some games and development teams would see this as a burden. Perhaps there ought to be a system of exemption.
As for Wii U: Cash ins like the late Darksiders II and Mass Effect 3 ports were bad ideas that were manifestly damaging to the reputation of the platform in early days. They were late old games, running badly. I'm being hard on the developers actually as its not their fault, but when it comes to a publishers motivation, ME3 releasing at launch, so late after other versions, and with a trilogy around the corner - it was just cynical. Look at how they leveraged their EA Access issues with Sony to deliver benefits to Microsoft too. These publishers have agendas and they can be predatory sharks who would happily distort the market and play King-maker if you let them.