I think this article way more fack than it deserves. Most of this should be seen in comparison of 3.x, which was an issue for a lot of people. Let's see:
Cantrips as At-Will Magic: Really, we're talking cantrips here. Even if they get a tiny bit better than usual, that's still weaker than a normal weapon. Besides, there's plenty of creatures that can "shoot magic" at will. We know D&D magic can do this. Doesn't it make sense for wizards to develope something for backup?
Keep Spells Under Control: The wording and example might be a bit messy, but this is a sensible suggestion. Spells that circumvented normal defense mechanics could really mess up 3rd edition (black tentacles comes to mind).
Reducing Total Spell Slots: In light of the other changes, this too, makes sense. Again, especially in the light of 3.5, spell slots got redicilous. And how often did anyone use 1st-3rd level spells at high level?
Spells Don't Automatically Scale: Spellcasters getting both new spell levels with more powerfull spells and spells of lower levels scaling at the same time means a significant power increase at every level that is hard for non spellcasters to keep up with. In addition, automatic scaling means a spell that is no problem when initially gained, could be ridiculous at higher levels.
Spellcasting Is Dangerous: Big misnamer here. It should rather be named "Casting a spell in combat is hard to do". Again, to me this seemed sensible and in line with traditional D&D. 4th is the only edition I can think of that did away with this entirely. And it makes sense. When you're fighting you are aware and reacting to people attacking you (duh). When casting a spell you concentrate on something that is definitely not fighting, weaving around your arms and reciting. Just try that while people come at you with a sword.
Keep Magic Items Under Control: Is this even still about the wizard? Was it ever? I'd assume most of this stuff goes for clerics to. I can see people not liking these suggestions. The scroll thing is bogus and I'd prefer wands as implements (maybe required to use cantrips)
Keep Buff Spells Under Control: I've always had my problems with buffs. 1 or 2 buffs? Awesome. Tracking masses of buffs (wether 3rd edition longtime or 4ths masses of 1 round buffs). Boo. So I'll not comment further, as I'm heavily biased.
Creativity, Not Dominance: Looks like riggid 4th edition style spell formulas are a thing of history. This is a huge boon for spellcasters all around and should ensure they're not completely nerfed. This also puts the magic back into spellcasting more than any definite rule ever could.
To me this all seems like it could put power levels of spellcasters in line with other classes while keeping them different and, well, magical.
That people argue against this collection of goals from both sides of the spectrum just shows you can't please everyone once again. I believe it's a good compromise for the core. The magic system should be a place where modularity especially extensive.