My Guess would be yes, but the limiting factor was cost. I would have voted for scandium, easier to machine, but it has limited availability.
Down the road, since scandium is mined only in the former Soviet Union, maybe Rohrbaugh could investigate a European source for a forged scandium billet. Maybe.
Becaue titanium is much, much more difficult to machine, work hardens easily, is heavier than an aluminum billet, makes it less desirable than a scandium/aluminum billet on a wish list.
With the Seecamp 380 (another cult gun) retailing for under $1,000 per copy, it would have been far more difficult to market a $1,400 Rohrbaugh.
Remember that Rohrbaugh was the dream of shooters, and not investment bankers. I have no doubt that these options were considered.