Watched Wrestlemania and it was pretty good. I started watching wrestling because of the Undertaker so it was pretty surreal to see him getting beaten at Wrestlemania. After thinking about it, Brock Lesnar seems to be actually a good choice. For one, we hear the term Reality Era mentioned lately and who else than Brock Lesnar is a more legit threat, the first WWE superstar to go to UFC and become world champion there, he is a REAL beast.
Aside from that, winning the streak for anyone else would be a big burden. Cena would get booed out of the building and if the rumours are right then Sting only wanted one last match so he doesn't gain anything or could transpire the momentum to another superstar. From what you hear, Taker wanted to have the streak broken multiple times in the past, so that's fine with me, also because he now can rightfully retire with decent health. Also now people will look on all the other aspects of his great career, big feuds with Kane and matches like the one with Mankind, etc. In a way the streak took away from his career so I feel good about it ending. It's also a classic move for big legends to go out with a loss.
I think what will happen now is that Lesnar will challenge Daniel Bryan for the title in the future, possibly at Summer Slam. Both have huge momentum now and beating Lesnar will establish Daniel Bryan even further, though todays matches already made him a big star.