It´s not a matter of it being easy/hard or people not being capable of saving up and buying a next gen console. Just because they can doesn´t mean they should, and if they like their PS3/360 collection of games I doubt they would just throw them away in exchange for some $$$.
Myself and many others could go buy a next gen console right now, but as long as the last gen version of the game is not officially dead, we´re still gonna prefer buying that version of the game. Why? Because that money we would spend (console, game, online fee) could be saved for something else, anything the person wants. People will jump to next gen when they feel like it, no one likes to be forced upon something.
Anyway, that´s just my opinion, maybe some of you disagree with my thinking, and that´s totally fine.
Agreed that no one likes having anything forced upon them, and you shouldn't.
If you want the last-gen version on that console, then that's fine.
I can see both sides of the coin, though, as I used to be in the same boat, pre-E3 2014.
When it was later said that MKX would be on next-gen and ported over later, that's when I decided to save up some cash and sell some older games and my old iPod and go current-gen.
I can understand not wanting to let go of your PS3, as PS4 isn't backwards compatible.
PS4 has PSNow (a paid service) in which you'll be able to rent / stream older games, but I just don't care for it.
X1 was just announced to have backwards compatibility, though, so that shouldn't be an issue for 360 users, starting within the next year.
Now, I'm not advocating 1 console manufacturer over another (I have a PS4 and my PS3) as PS4 also will have a PSNow option to rent / stream older-gen games too, but I personally don't care for it and I'm just saying how the current state of how things are and speaking my personal opinion on the matter.
I don't agree or disagree with you, but I'm just letting you know that there ARE other options as far as upgrading goes, should you choose to later go that route.