While I agree with you on most of your suggestions, I don't see the point in number 2, it contradicts everything else you mentioned. Tutorials, in-depth detailed manuals and the like are there for a reason: To prepare a player. What's the point in having a tutorial when you demand an even lower general difficulty anyway so a "noob" can clear the grids?

2. Lower the bronze requirements - so players can generally open up all the grids. This doesn't affect hardcore players since gold requirement can still be set high so good players are still rewarded, but noobs can still finish the campaign rather than getting stuck and giving up on the game.
Your second point in general reflects casual gamers' approach to games and the unfortunate accomodation by producers nowadays: Everyone should be able to complete a game. While I agree on that everyone can, I don't think each and everybody should, not without practice, trying and a decent amount of dedication. You said "but noobs can still finish the campaign rather...". Isn't that the complete opposite what a game should try to do? I.e. feature a learning curve that requires the player to get better in the process and eventually when he has reached a certain level (usually found by producers through balancing) will release him from that "noob" status, and as a result he will finish the game. Don't you think, that, by that, a "noob" shouldn't be able to finish any given game in the first place anyway? It would make the whole task of video gaming redundant.
Pulse is the easiest WO to date, by far. It's been said many times that even Pulse's Gold requirements ignore many, many mistakes, whereas they required perfect use of Boost Pads, and (most of the time) perfect laps in Pure (and the former WOs, for that matter).
Maybe it's just my being from the first gaming generation, but I don't see the point in an easy game I know I will finish with time anyway, rather than having to try hard- really hard and with some games still won't finish them because I didn't try hard enough (Ikaruga, anyone?).