I don't have an answer for the original poster, (I'd prefer QQQ and IWM match SPY's current expirations before SPY goes 5 days a week)
but this topic reminded me of some history on the subject I learned a month or two ago.
I can't remember the precise details and words said, but it was Tom Sosnof (founder of TastyTrade and ThinkorSwim), when he was a floor trader at the CBOE started the discussion and pushed the changed in option expirations. I can't remember now if he drove the change from monthlies to weeklies overall, or weeklies to dailies for SPY. It was one of those big changes.
Just like my trading sometimes, I'm sure if I said he change one, I'd be wrong because he changed the other. Ha. It was one or the other.
I admire people like Tom who go beyond just talking about, "wouldn't it be nice", "I wish things were different", but puts the leg work into it and pushes hard to change the system.
Please don't take this as a stab at anyone here saying "I wish" or "wouldn't it be nice".
These conversations need to happen first, if any change (if it should even get done) gets done.
Just wanted to share some option history that I learned that I thought was really neat.