I agree they would revert to him being a workhorse if A) a coach is not specifically told not to do that by DW/New GM B) we do not actually have a goalie better than him.
This year for example, Dubnyk was not better than Jones, straight up wasnt. Sure maybe some fans liked how he looked in net better, or thought the team played better in front of him or something, but statistically he was not better. So while I agree with your concern, I also think that this team has not had anyone clearly superior to Jones yet to make him sitting actually feasible in the long term.
As for the bolded, why did you ask the original question if even you think its possible he could be a top 4 dman?
Did you mean to ask if anyone thought he would be one by next season or something?