You're naive if you believe that a shaky U2 with no clear direction that has already played the sessions for Lillywhite won't come crawling back to him in a bind. That's their way, and while it used to work for them, Lillywhite has not been the sole producer of a great album since the 90s. He's written some successful pop songs, but a lasting work of art? It's been a while. While I have no problem with him sharing his opinion, I'm not oblivious to the fact that he will have his hand at these tracks eventually; it already seems as if he's trying to sell himself.
I don't actually believe Lillywhite ruined HTDAAB; it's about even for me. He polished the edge clean off the record, but a number of the songs (SYCMIOYO especially) were so bad that further work was certainly required. That album is faceless, and he hardly stamped a personality onto it, but I'm not sure it ever could have been great, considering the circumstances.
There's an important distinction to make here: Lillywhite mixed Breathe, but he didn't write it. Edge and Lanois did. The raw material was already in place before Lillywhite could make his suggestions, so the product was actually pretty great. In contrast, Lillywhite and will.i.am were always behind Crazy Tonight, so there it lies. He's the "closer," apparently, so I guess he doesn't need to be a songwriting savant, but it would make me think a little more highly of him if he was writing these tracks I love so much instead of fashioning them into U2-ready products. The further he is into the songwriting process, the less damage he causes. I would prefer that he stay away entirely for this next one (TUF, Zooropa and Pop are all brilliant albums in my view, none of them involving Lillywhite), but that's just me.
Much credit to him for asking the band to play new songs live: I think that's a no-brainer for any band who wants to develop their songs properly. It offers instant feedback and gets the band more comfortable with the pace and flow of the songs so they can improve it later. It toughens the songs and makes them more direct, as opposed to studio tinkering.