Two reasons I can think of: (1) We'd had two episodes to get to know Cassandra; House is a horrific monster who's spent the entire episode torturing the main characters. I'd have zero interest in watching his death scene when I could be watching a goodbye scene between the Doctor and the TARDIS. (2) According to Gaiman in the Guardian yesterday, he wanted it to be ambiguous whether House did die (apparently in an early script it was obvious that he didn't).
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Two reasons I can think of: (1) We'd had two episodes to get to know Cassandra; House is a horrific monster who's spent the entire episode torturing the main characters. I'd have zero interest in watching his death scene when I could be watching a goodbye scene between the Doctor and the TARDIS. (2) According to Gaiman in the Guardian yesterday, he wanted it to be ambiguous whether House did die (apparently in an early script it was obvious that he didn't).