Whither, the major symphony orchestra concertmaster? If your job is in England, like the London Symphony Orchestra's Roman Simovic, your title is Leader.
For sure, there have been concertmasters of the past that had a solid career outside of their main gig—solo works, chamber music, etc. The best of them could rely on a couple of concerto performances a year, with their own orchestra, or the best of them, with first class ensembles (Boston Symphony's Joseph Silverstein as example). But, for violinists aspiring to be a soloist, the pool of concert appearances is relatively thin. The pool has to accomodate stellar violinists such as Perlman, Mutter, Hilary Hahn, Gil Shaham, and many others. So, for many fine violinists, concertmaster it is. Hey, as we say, 'a gig's a gig'.