I would have to dig the notes out again but I think with oil contaminating LP fuel the rate of oil depletion is much less than HP fuel contaminating the oil thus buying valuable time with the engine still running.
Like you the I found the picture of the Ice accretion very worrying and the modified FOHE can't come soon enough. Practically the retro-fitting of the new units won't happen overnight, with 500+ Trent 800's on wing manufacturing and supplying the units post certification is a logistical challenge in its self.
More research into fuel will definitely be a good thing. The fact that a lot of the design regulations are based on 50 year old research indicates to me that this is long overdue !