To reform the Senate: Why term limits?

What is Harper trying to achieve?

Let’s set aside, for now, the inherent ridiculousness of Bert Brown chiding fellow Conservative members of the Senate — intended as a chamber of sober second thought, and at least nominally a check on the House of Commons — for their lack of loyalty to the prime minister.  Here’s something I’ve never really understood about Harper’s bid to implement a term limit of eight (now nine) years for appointed Senators:

What problem with how the Senate is currently constituted and functions is this designed to solve?

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