I wish Dennis DeYoung, Tommy Shaw, and James Young could drop all hostilities and get back together for one last big tour to finish their era. Then Styx would certainly be inducted into the Rock Music Hall of Fame. They should be there. And I would be there for at least one of their tour dates.
Then I would without a doubt bring back Led Zepplin for a huge tour. They were the one band ahead of their time if there ever was one. The only hold out before was Robert Plant. Reportedly, he turned down a 100 million guarantee to rejoin the band for a big tour, so this probably won't happen.
And saving the best for last. I have heard rumblings that Rush may be considering finding a replacement for legendary drummer Neil Peart and putting together a huge tour. I would probably mortgage my house to get tickets for this one. Peart, Geddy Lee, and Alex Lifeson, IMO, were the 3 greatest individual musicians to ever pick up their respective instruments and play together.
One can only hope Jack!!