...an interesting idea but one that I don't see leaving the ground, for these reasons:
a) Cost - while Canada hibernates under a blanket of cold the mini camps would need to be held in warmer climes, the southern US. Who would pay for these camps? With no paying customers to foot the bill of facility rentals, staff costs, meals, lodging for players, etc. the clubs themselves would be responsible, and many (if not all) do not have this budgetary ability. So you say 'hold the camps indoors up here' which leads us to the second problem,
b) it's a long season already, and because many of the CFL players come from lands far away they are already absent from family for seven/eight months of the year. Now you're asking for them to be away from home for more time? Remember, the CFLPA is there for a reason, and protecting a balanced life for its members is one of them.
...as ideas go it's a good one, but one that we won't be seeing soon....