Larry Page has been described as possibly the most ambitious CEO on the planet, and this announcement certainly bears that out. Alphabet represents an ambitious attempt at reinventing Google. Possibly fraught with risk - but again Larry seems to be following his own advice of "having a healthy disregard for the impossible". So they are attempting to do something crazy - break up and restructure the company rather than stay comfortable. And as I commented on the original post - entreprenuers are most excited when creating new things.. and you can feel Larry's palpable excitement in creating Alphabet.
Also, the meteoric rise of Sundar Pichai - who becomes the CEO of Google - is nothing short of remarkable. Think about it - both Google and Microsoft - the 2nd and 3rd most valuable companies in terms of market cap - are both headed by people who were born and educated in India. That is pretty remarkable too...and makes me doubly proud - to be an Indian and a fellow IITian! Sundar is also from Chennai originally - so that adds a third thing to be proud of for Chennaites..