I don't think so, Light Packet is already essentially what CP is bringing in for domestic Letterpost, that is, rigid or boxed items will be considered packages even though they are under the 2 cm thickness limitation.
When USPS brought in similar policies in 2007 prices rose dramatically, as an example shipping a cd increased by 34%.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
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