Yes... and no.
I think its a fair bet that if the oppo have never put anybody up at the last five defensive lineouts on their own 5m line, they wont on the 6th.
The point being made however is a somewhat faceitious one, and not in reality likely to happen - I am illustrating however the point that given a gamble as described (and you are right - it is) - why coudnt that action occur ? - bottom line - no reason at all
Is that ludicrous ? Obviously.
Would it NEVER happen? Never say never - and if there is one thing this wonderful forum has shown me over the years/decades, weird and wonderful scenarios nobody ever envisaged DO happen. I even pre-empted the Italian lineout defence non engagement tactic years before they bamboozled England with it, and was roundly told here it would never happen and nobody would be that daft to try it. Guess what ;-)