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Mike:
Well, there is the age old reaction of oil to cloth - rot. Now, how soon does this effect take place you have to wonder - 1 year, 5 years, 25 years, or a century? I think that would largely depend on the humidity and temperature at which the painting was stored, but certainly unprimed, your painting will eventually evidence problems with canvas deterioration. Again, this timeframe may be in the decades of time, and you live in a fairly dry area of the country.
I am wondering if you can get the look of the linen with just using a size - either a PVA glue or rabbit skin glue. I think I know what you are wanting though and a size would darken the linen and mat down the nubs.
Also consider that raw linen would be a bit harder to stretch and maintain a tight surface than a primed one.
What is the painting for? If it is for a client, I think you may need to look to an alternative, but if it is for yourself or your family, then maybe the risks of using raw linen is worth considering.
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