You're right - that won't solve anything other than installing a few suites closer to the action (that needs to be done too though).
I would hope that they figure out a way of making 2 decks wrap around the arena. For example, raise that old 300s sections at the far side of the rink to be parallel with the yellow "Go Huskies Go!" sign (HFD would hate this drawing by the way...YELLOW?!?!?). Fill in the spaces in the corners with seating on a second level. Move the lounge/bar upstairs and fill up the entire second deck behind that goal. In the space left, add additional lower level seating up to the "yellow line". Do the same on the opposite side of the arena but leave the second deck for seating. Get the lower capacity to 7-8K and curtain off anything above the yellow line (except lounge/bar and nosebleed skyboxes) for UConn hockey.
I think renovating the XL is going to be tougher than we all think. It's a puny arena jammed into a small little space in an old shopping mall. Unless they can find a way to expand stuff into the old mall sq footage, space is limited. They might be better off starting from scratch.