This would be a great move for the Knicks. Frank has no alliances to D'Antoni and the rest of his staff. Frankly, Frank would be a hired specialist brought in to do one thing that D'Antoni nor anyone on his staff has had the Knicks do in their three years in NY: defend and defend well. Perhaps this new voice would add some seriously needed life into the team's defensive scheme.
This would also be a smart move for Frank. First of all, if he stays in Boston, there is no chance of his ultimately taking over the head spot there, as Doc Rivers just signed an extension. On the flip side, D'Antoni might be on his last legs as his deal runs out after this coming season. If Frank can get this team to defend, the Knicks should be a force in the East. I'd say that would be a great resume boost for Frank in his attempt to land another head coaching job. New York is the biggest stage for any player or coach. If Frank succeeds here, the spotlight will be on him unlike if he did the same in another city.