To answer some questions
1) Goldberg did deliver that superkick that gave a concussion to Hart, he didn't imediately retired, but it could be one of the reason why he had to, he didn't took a break after that, he wrestle some more but then it was too late. So yes Bill is responsible for it, accidentaly obviously, but is it just HIS fault? I dunno
2) The Lesnar/Goldberg match was boring because mostly it was badly booked to start with, it should had been a NO DQ or HIAC or something like that. Just a regular match... nop. But the big problem was that both wrestlers contract where ending, so they didn't gave a shit... they just cash there pay check. Even tough there older... i have a feeling the next one should be much better. Not 5 star rating obviously but entertaining.
3) I think Lesnar will win as well, but i hope it will not be Goldberg last match, i would love to see it become a trilogy and end on a Goldberg win at mania once again, something like that, but this time in a great way.
Hulk Hogan vs Shawn Michaels was shit because Hogan's ego got in the way. It was supose to be a trilogy, then Hogan said his body couldn't take it anymore and blablabla, originaly Michaels was supose to win the first match but Hogan having power like he did backstage was able to have the win. HBK decided to troll and oversell everything, it was at least funny to watch.