I can understand that people are down on Walsh. He did not look good in summer league. But he is only 20 years old, younger than Davison, Scheierman, and Watson. I would have liked to see more development after 1 season, but I don't think it is time to give up on him. We can afford to have a few prospects on the roster.
We have our established top 8 rotation, the playoff rotation. Then we have about 5 that are deeper bench, but are pretty solid (Tillman, Kornet, Queta, Springer, and maybe Walker if makes it). Those last 4-5 have established NBA track records as bench players (Queta maybe on the bubble of that). They have proven that they are fine to fill in when needed throughout the course of the regular season. Then we have 2 prospects, Walsh and Scheierman, who are not going to do much.
I am fine with that mix. We need to keep a few prospects on the roster and hope that over time, 1 or 2 hit (like Hauser did) and end up helping the team. Most 14th or 15th roster players will not ever make it. I prefer this to an over the hill veteran that isn't going to help the team and never will.