Linkin Park is a brand, one of the most important bands in the planet... most of the hits of LP's career are songs that Mike can't handle on his own. When he tries to sing high it's just a mess... you just have to remember the NRL live debut.. also there's no way that Mike can scream... screaming is one of the signature LP sounds .
As much as you feel nostalgic, sad.. etc Mike is a very limited singer.
Touring with guests would be the best option for me... that would be very interesting... make that happen and the guests won't feel the heat of the fan base.. what if someone actually does a great job and fans wants him to stay?
Watch Queen with Adam Lambert... it's so fuckign great... the band and fans are having a blast every night... https://www.youtube.com/watch?v=utJ9hU4cjiA