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I've got a road bike made of 853 and the down tube is bubbling a bit at the back, from salt on the road I guess. Presumably, especially seeing as apparently its a thinner walled 'Pro team' version, it will rust right through at some point in the future?
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How long will that take do you think?
Couldn't tell without better pics.
I would get it sorted. Either gentle grade sandblasting and a respray is all thats needed.
If it's gone right through then a welder or proper bike repairer (Argos?) could weld over a hole and rubbed down for a smooth finish?
If it's severe. then a repair and respray-well you could treat yourself to a new frame for the price-depending on quotes.