I have no problem with doing both on the first two options. For rolling for hp/attributes, I think every edition ever has had an option for that and there's no problem keeping that option available (as long as point buy is also an option).
For separate xp by class, I don't know how you would print both options without making a head-ache for yourself, but if you can put both options in there and it brings back some groups, great, do it.
Save-or-die / save-or-suck effects are a much trickier subject. We all rely on the monster manuals or published adventures occasionally when we're low on prep-time, and if the published material is full of monsters who stun/paralyze/banish/kill pcs with a single attack, that makes it a major head-ache for me, as I find that type of gameplay very frustrating and un-fun. Yeah, I can work around it and not use those monsters if I have to, but if that mechanic is built into the core of the game, it makes the game a lot less fun for me and makes me question why I would give up 4e for the new game.
I understand that a large collection of players (like the OP) feel the exact opposite way and would feel like things were less fun without paralyzing Medusas, or the cleric being able to banish the pit fiend in one attack if it fails its save (pick your example of choice). That's why I said in my first response that it will be impossible to have an edition for everyone. If WotC can manage to come up with a system that can make players on both sides of the save-or-suck divide happy, it would be amazing, but I'm having trouble imagining how you would do that.