The problem with titanium is not the corrosion, but contamination. When you bond two different materials together, carbon and aluminum, steel and aluminum, titanium and steel, there are two basic problems. The two materials expand and contract at two different rates and if the two materials are bonded, there is a contamination problem to contend with. It seems that over time, a certain bacteria like substance attacks the bonding material and makes it weak. Then stress and fatigue finish breaking down the bond. I do not think that the liners are bonded to the barrels though, they are pressed together. How long will they last? Who knows. It would also be interesting to see the chambers over time, see how they last. Although titanium is stronger than steel, it is also more flexible. Wonder if there is more expansion of the chamber and the added stress it will create. It is a great material, just don't know if this is a good application.
Robert