I'd bet he's only tired being center of attention.
If he really think that, he should've done something to prevent himself become "leader"/"center" of ETH such as quit from ETH's community/development just like what Satoshi did.
The 'good' thing about being a main man project is that it's way easier to implement changes to the protocol.
Ethereum's ecosystem is also way friendlier than Bitcoin's ecosystem with how the geeky developers there absolutely adore this dude. If Vitalik wants something to happen, then it happens. Ethereum's only problem is that their upgrades tend to be quite buggy, which causes severe delays up to a year or more.
Vitalik last year even said that he will write a hard fork in case he is forced to do so. Says enough.
![Roll Eyes](https://bitcointalk.org/Smileys/default/rolleyes.gif)