change horses in midstream

「何かの途中で、リスクを冒して、プランそのもの、またはリーダーを変える」。川を渡ってる途中で馬を変える、と。語源は1964年のAbraham Lincolnのスピーチだそうです。

Roundup: Twitter attack mania, Apple tablet rumor update, down rounds beat up rounds in Q2 on VentureBeat

“Evan Williams is the perfect embodiment of the Silicon Valley ethos that business plans are oppressive things, to be deferred as long as possible.” — In response to a Cassandra post about Twitter’s future circulating among New York’s Internet literati, Valleywag editor Ryan Tate retorts that Twitter founder Evan Williams has, unlike his critics, succeeded again and again — not despite, but because of his ability to build a company on a hunch and change horses midstream, rather than starting with a full go-to-market-and-then-exit plan.