Jones could and probably will unless guys like Trapp take the next step.
Beasley I kinda get because there's no USMNT fullback depth, especially none available for Camp Cupcake. As Yedlin, Johnson, Chandler, Castillo, and Lichaj are all in Europe or Mexico. Though, you can easily make a case that right now Matt Besler is a better full back that DeMarcus Beasley, and Besler was excluded from the roster.
Wondo though I don't get. Why not bring on Shelton?
Related, I don't understand the choice of bringing Feilhaber over Nguyen. Feilhaber is older and not much if at all better. Personally I'd rather see someone younger than Feilhaber or Nguyhen on the roster
Overall Arena's lineup bad choice is like a combination of him reading MLS subreddit to see who people have been pissed off for Jurgen "snubbing" (Feilhaber, Dax, and Marshall) and him being in MLS too long (Wondo, Robles, Frei, Rimando, Marshall)
Meanwhile you have young talents like you mentioned, also for a team that's missing fullback depth (to the point that Arena listed Zusi as a defender) why the heck aren't you picking Hollingshead? Or Polster?
Also what about Kelyn Rowe? Why isn't he getting a look? He's youngish, and has been one of the best MLS central mids for a few years now. You'd think Arena's ties to MLS would bring Rowe in.