I don't think so. It is an item for supports, and 2k gold on a support is significant. Having it cancel TPs doesn't really add a lot more value to it. Supports will still pick it up because of the fairly cheap build up and the utility. The added bonus of canceling a TP would be just that, a bonus. How often are you canceling TPs? Does it not cancel Engima's ultimate?
The ability to move 600 units in combat is tremendously powerful. Judging by how often it gets picked up, it's not in any need of a buff.
No, force staff does not cancel channeling abilities. This includes black hole.
From my recollection of my dota playing days in 2005-2007, silences did not affect your ability to tp.
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