Please note that the Titanium will be heavier than the aluminum alloy used on trekking poles.
Sometimes overlooked is the quality, as distinguished from the type of the material. I don't find any of the carbon trekking pole vendors advising whether the material is pultruded, wrapped or filament wound. Alloy info is also lacking on the aluminum poles.
We really are at the mercy of the pole manufacturers here, and our best bet may be to rely on the most reputable brands sold by vendors with consumer friendly return policies – the theory being that if they are concerned about their reputation and don't want a lot of returns, the quality will be above average. Admittedly, it's just a theory.
Another theory is that ski poles will be better quality to withstand the high stresses of skiing. Again, just a theory.
So I think we can bat this around forever, but won't get very far with the information that's available.
For trekking, I'm using a Scott Italian made ski pole of aluminum alloy, around 8 oz each (only use one) with extended ribbed grips and a mud basket, and hope it will not fail in the midst of a long trip. I just like this pole for the long grip, and the novel cam upper lock that allows instant length adjustment. However, the lower lock is a pushbutton that will eventually wear out and get loose like they all do.
For day hiking, I would use a lighter carbon pole, like a Locus, because if it breaks, it's much less of a problem; but for day hiking I never feel the need to use a super light pole anyway. The current offerings of the major brands, like Leki, Komperdell and Black Diamond, may be fine also if they have camlocks.
So for the ultra reliability and strength needed for trekking, I don't think we'll see anything super light for some time. It could be done with high quality filament wound carbon fiber or the best aluminum alloys, but would be very expensive and limited to a small niche market that wouldn't be profitable.